1. CLASS XII MATHEMATICS LONG ASSIGNMENT
1. Write the smallestequivalence relationRonsetA = {1, 2, 3} .
2. | πβ| = 2 , | πββ| = β3 , | πβ| .| πββ| = β3 . findangle between πβ πππ πββ .
3. Evaluate :- tan -1
(β3 ) β sec -1
( -2).
4. If A = (
4 6
7 5
) , thenwhat isA. ( Adj A)?
5. For whatvalue of k, the matrix (
2π + 3 4 5
β4 0 β6
β5 6 β2π β 3
) isskew - symmetric?
6. If |
sin πΌ cos π½
cos πΌ sin π½
| =
1
2
, where ο‘,ο’ are acute angles,thenwrite the value of ο‘ + ο’.
7. Write the principal value of tan-1
(1) + cos-1
( - Β½ ) .
8. Write the value of tan ( 2 tan-1 1
5
).
9. Findthe value of a if [
π β π 2π + π
2π β π 3π + π
] = [
β1 5
0 13
] .
10. If [
9 β1 4
β2 1 3
] = π΄ + [
1 2 β1
0 4 9
] , thenfindthe matrix A.
11. If |
π₯ + 1 π₯ β 1
π₯ β 3 π₯ + 2
| = |
4 β1
1 3
| , thenwrite the value of x.
12. If a unitvector πβ makesangles
π
3
with πΜ ,
π
4
with πΜ andan acute angle ο± with πΜ , thenfindthe value of ο±.
13. For whatvalue of x, isthe matrix A = [
0 1 β2
β1 0 3
π₯ β3 0
] a skew β symmetricmatrix ?
14. If matrix A = [
1 β1
β1 1
] and A2
= kA,thenwrite the value of k.
15. If A ij isthe cofactorof the elementaij of the determinant |
2 β3 5
6 0 4
1 5 β7
|,thenwrite the value of a32 . A32.
16. Write the value of tan-1
[ 2 sin( 2 cos-1 β3
2
)].
17. Write the principal value of tan-1
(β3) β cot-1
( -β3 ).
18. Find| π₯β| , if for a unitvector πβ ,( π₯β β πβ ). ( π₯β + πβ ) = 15
19. Write the inverse of the matrix [
cos π sin π
βsin π cos π
] .
20. Write the value of x + y + z if [
1 0 0
0 1 0
0 0 1
] [
π₯
π¦
π§
] = [
1
β1
0
].
21. Usingprincipal values,write the valueof 2cos-1
Β½ + 3 sin-1
Β½ .
22. If A is a square matrix of order 3 such that | π΄ππ π΄| = 225, find | π΄β²|.
23. Write the distance betweenthe parallelplanes2x βy + 3z = 4 and 2x β y + 3z = 18.
24. Evaluate tan-1
[2 cos(2 sinβ1 1
2
)] .
2. 25. What isthe principal value of cos-1
(cos
2π
3
) + sin-1
(sin
2π
3
) ?
26. Write the value of sin [
π
3
β sinβ1 (
1
2
)] .
27. For whatvalue of x, the matrix [
5 β π₯ π₯ +
2 4
] issingular?
28. For whatvalue of βaβ the vectors2πΜ β 3πΜ + 4πΜ and aπΜ + 6πΜ β 8πΜ are collinear?
29. If A = [
2 3
5 β2
] , write A-1
in termsof A.
30. Findthe value of x andy if :- 2 [
3 4
5 π₯
] + [
1 π¦
0 1
] = [
7 0
10 5
] .
31. What isthe principal value of cos-1
(cos
3π
4
) + sin-1
(sin
3π
4
) ?
32. Evaluate cos [
π
6
+ cosβ1(
1
2
)] .
33. For whatvalue of x, the matrix [
5 β π₯ π₯ +
2 4
] issingular?
34. If A = [
1 1
1 1
] satisfiesA4
=ο¬A, thenwrite the value of ο¬ A.
35. Findthe value of x + y from the followingequation :- 2 [
π₯ 5
7 π¦ β 3
] + [
3 β4
1 2
] = [
7 6
15 14
] .
36. Findthe scalar componentsof the vector π΄π΅ββββββ withinitial pointA(2,1) andterminal pointB(-5,7).
37. What isthe principal value of cos-1
(cos
2π
3
) + sin-1
(sin
2π
3
) ?
38. Evaluate :- cos (tanβ1 3
4
) .
39. For any vector πβ , evaluate :- ( πβ . πΜ)πΜ + ( πβ . πΜ) πΜ + ( πβ . πΜ) πΜ.
40. If A = [
2 4
4 3
] , π = [
π
1
] , B = [
8
11
] and AX= B, thenfindn.
41. For whatvalue of x, the followingmatrix issingular? [
7 β π₯ π₯ + 2
5 4
]
42. Evaluate : |
102 18 36
1 3 4
17 3 6
|
43. What isthe principal value of sin-1
(sin
5π
6
) + cos-1
(cos
π
6
) ?
44. What isthe principal value of cos-1
(β
β3
2
) ?
45. Evaluate : |
π π π
π + 2π₯ π + 2π¦ π + 2π§
π₯ π¦ π§
|
46. Write the positionvectorof a pointdividingthe linesegmentjoiningpointsA andB withpositionvectors πβ and
πββ externallyinthe ratio1 : 4, where πβ = 2πΜ + 3πΜ + 4πΜ and πββ = βπΜ + πΜ + πΜ .
47. If Adj A = [
3 5
7 β2
] and Adj B = [
2 β3
β5 2
] , findAdj AB .
3. 48. Write the value of x β y + z from the followingequation: [
π₯ + π¦ + π§
π₯ + π§
π¦ + π§
] = [
9
5
7
] .
49. Evaluate :- |
cos15Β° sin 15Β°
sin 75Β° cos75Β°
| .
50. Write the projectionof the vector πΜ β πΜ onthe vector πΜ + πΜ .
51. What isthe principal value of cos-1
(β
1
β3
) ?
52. For a 2 ο΄ 2 matrix,A = [ aij ],whose elements are givenbyaij =
π
π
, write the value of a12 .
53. Write A -1
forA = [
2 5
1 3
] .
54. Write the value of tanβ1 3
4
+ tanβ1 3
5
.
55. If [
π₯ + 3 4
π¦ β 4 π₯ + π¦
] = [
5 4
3 9
], findx andy.
56. What isthe principal value of sin-1
(sin
5π
6
) + tan-1
(tan
π
6
) ?
57. Findx if |
2 5
β1 4
| = |
5π₯ β 2 1
β4 3
| .
58. If πβ = πΜ + 2 πΜ β 3 πΜ and πββ = 2 πΜ + 4 πΜ + 9 πΜ , finda unitvector parallel to πβ + πββ .
59. Findthe value of cos [
π
6
+ cosβ1(
1
2
)] .
60. Suppose thatVijaygoestoa grocery store and purchase the followingitems:Vijay:tenapples,1 dozeneggs,
twodozenoranges.Constructthe 1 x 3 matrix.
61. Findthe principal value of tan-1
β3 - sec-1
(-2).
62. Let A be a square matrix of order 3 ο΄ 3. Write the value of |2π΄|, π€βπππ | π΄|= 4.
63. Write the value of (πΜ Γ πΜ) . πΜ + πΜ . πΜ
64. Write the order of the product matrix : [
1
2
3
] [2 3 4] .
65. What isthe principal value of tan-1
(tan
7π
6
) + cot-1
(cot
7π
6
) ?
66. Simplify:cos ο± [
cos π sin π
β sin π cos π
] + sin π [
sin π β cos π
cos π sin π
]
67. What isthe value of the followingdeterminant? β = |
4 π π + π
4 π π + π
4 π π + π
|
68. If πβ and πββ are two vectorsuch that | πβ . πββ| = | πβ ο΄ πββ| , write the angle between πβ and πββ .
69. From the followingmatrix equation,findthe value of x :(
π₯ + π¦ 4
β5 3π¦
) = (
3 4
β5 6
) .
70. What isthe principal value of sin-1
(sin
2π
3
) ?
71. If sin-1
x β cos-1
x =
π
6
, thensolve forx
4. 72. Prove that cot -1
7 + cot-1
8 + cot -1
18 = cot-1
3
73. If a + b + c οΉ 0 and |
π π π
π π π
π π π
| = 0, thenusingpropertiesof determinants,prove thata= b = c.
74. Showthat the functiong(x) =| π₯ β 2| , x ο R, iscontinuousbutnot differentiableatx = 2.
75. Differentiate log( x sin x
+ cot2
x) withrespecttox.
76. Showthat the curvesxy= a2
and x2
+ y2
= 2a2
toucheach other.
77. Separate the interval [0,
π
2
]intosub β intervalsinwhichf(x) =sin4
x + cos4
x is increasingordecreasing.
78. Showthat the differential equationxdy βydx = βπ₯2 + π¦2 dx ishomogeneousandsolve it.
79. Findthe particularsolutionof the differential equation:-
cos x dy = sinx ( cos x β 2y) dx,giventhaty = 0, whenx =
π
3
.
80. Finda unitvectorperpendiculartothe plane of triangle ABC,verticesare A (3, -1, 2), B ( 1, -1, -3) and C ( 4, -3, 1).
81. Evaluate :- β«( 2 sin 2π₯ β cos π₯) β6 β πππ 2 π₯β 4 sin π₯ dx.
82. Evaluate :- β«
5π₯
( π₯+1)(π₯2+ 9)
dx
83. Evaluate :- β« π₯ (tanβ1 π₯)21
0 dx.
84. Evaluate :- β« cotβ1( 1 β π₯ + π₯2) ππ₯.
1
0
85. Findthe equationof the plane throughthe pointsA (1, 1, 0), B (1, 2, 1) andC ( -2, 2, -1) and hence findthe
distance betweenthe plane andthe line
π₯β6
3
=
π¦β3
β1
=
π§+2
1
.
86. A givenrectangularareaisto be fencedoff ina fieldwhose lengthliesalongastraightriver.If nofencingis
neededalongthe river,showthatleastlengthof fencingwillbe requiredwhenlengthof the fieldistwice its
breadth.
87. From the pointP( 1, 2, 4) perpendicularisdrawnonthe plane
2x + y β 2z + 3 = 0. Findthe equation,the length&the co β ordinatesof footof perpendiculars.
88. Usingpropertiesof determinants,prove |
1 π₯ π₯2
π₯2 1 π₯
π₯ π₯2 1
|= ( 1 β x3
)2
.
89. Prove that :- tanβ1 (
1
2
) + tanβ1 (
1
5
) + tanβ1 (
1
8
) =
π
4
90. Showthat the functionf inA = IR - {
2
3
} definedasf(x) =
4π₯+3
6π₯β4
isone β one and onto.Hence findf-1
.
91. Differentiate the followingfunctionwithrespecttox : ( logx)x
+ x log x
.
92. If y = log[ x + βπ₯2 + π2 ],showthat ( x2
+ a2
)
π2 π¦
ππ₯2
+ x
ππ¦
ππ₯
= 0.
93. If x = a sint andy = a ( cos t + logtan
π‘
2
), find
π2 π¦
ππ₯2
.
94. Evaluate :- β«
sin( π₯βπ)
sin( π₯+π)
dx.
5. 95. Evaluate :- β«
5π₯ 2
1+2π₯+3π₯2
dx.
96. Evaluate :- β«
π₯2
( π₯2+ 4)( π₯2+ 9)
dx.
97. A companymanufacturestwotypesof sweaters,type A andtype B,it costs Rs.360 to make one unitof type A
and Rs.120 to make a unitof type B. the companycan make at most300 sweaterscanspendamountRs.72000 a
day.The numberof sweatersof type A cannot exceedthe numberof type Bby more than100. The company
makesa profitof Rs. 200 oneach unitof type A but consideringthe difficultiesof acommonmanthe company
chargesa nominal profitof Rs.20 ona unitof type B. Using LPPsolve the problemformaximumprofit.
98. Bag I contains3 redand 4 blackballsandBags II contains4 red and 5 black balls.One ball istransferredfromBag
I to bag II andthentwo ballsare drawn at random( withoutreplacement)fromBagII.The ballssodrawn are
foundto be bothred incolour.Findthe probabilitythatthe transferredball isred.
99. Evaluate :- β« ( | π₯| + | π₯ β 2| + | π₯ β 4| ) ππ₯ .
4
0
100. Usingvectors,findthe area of the triangle ABCwithvertices
A (1, 2, 3), B ( 2, -1, 4) andC ( 4, 5, -1) .
101. A speaktruthin 60% of the cases,while Bin90% of the cases.In whatpercentof casesare theylikelyto
contradicteach otherinstatingthe same fact?
102. Showthat the differential equation 2π¦π
π₯
π¦ dx + ( y - 2π₯π
π₯
π¦ ) dy= 0 ishomogeneous.Findthe particularsolutionof
thisdifferential equation,giventhatx = 0 wheny = 1.
103. Findthe intervalsinwhichthe functionf (x) =
4 π₯2+ 1
π₯
is(a) strictlyincreasing(b) strictlydecreasing.
104. Findthe pointsonthe curve y = x3
at whichthe slope of the tangentisequal to the y β coordinate of the point.
105. Findthe general solutionof the differential equation:- x logx.
ππ¦
ππ₯
+ π¦ =
2
π₯
. πππ x
106. Findthe coordinatesof the point,where the line
π₯β2
3
=
π¦+1
4
=
π§β2
2
intersectsthe plane x β y + z β 5 = 0. Also,
findthe angle betweenthe line andthe plane.
107. Findthe vectorequationof the plane whichcontainsthe line of intersectionof the planes
πβ .( πΜ + 2πΜ + 3 πΜ ) β 4 = 0 and πβ .( 2πΜ + πΜ β πΜ ) + 5 = 0 and
whichis perpendiculartothe plane πβ .(5πΜ + 3πΜ β 6 πΜ ) + 8 = 0 .
108. A school wantsto awardits studentsforthe valuesof Honesty,RegularityandHardworkwithatotal cash award
of Rs.6000. Three timesthe awardmoneyforHardwork addedto that givenforHonestyamountstoRs. 11000.
Te awardmoneygivenforHonestyandHardworktogetherisdouble the one givenforRegularity.Representthe
above situationalgebraicallyandfindthe awardmoneyforeachvalue,usingmatrix method
109. Showthat the heightof the cylinderof maximumvolume,thatcanbe inscribedina sphere of radiusR is
2π
β3
.
Also findthe maximumvolume.
110. Usingintegration,findthe areaboundedbythe curve x2
= 4y andthe line x = 4y β 2.
6. 111. Usingintegration,findthe areaof the regionenclosedbetweenthe two circlesx2
+y2
= 4 and (x β 2)2
+ y2
= 4.
112. Assume thatthe chancesof a patienthavinga heartattack is40%. Assumingthata meditationandyogacourse
reducesthe riskof heart attack by 30% and prescriptionof certaindrugreducesitschancesby25%. Ata time a
patientcan choose anyone of the twooptionswithequal probabilities.Itisgiventhataftergoingthroughone of
the two options,the patientselectedatrandomsuffersaheartattack. Findthe probabilitythatthe patient
followedacourse of meditationandyoga.Interpretthe resultandstate whichof the above statedmethodsis
more beneficialforthe patient.
113. Showthat :- tan (
1
2
sinβ1 3
4
) =
4β β7
3
.
114. Considerf : R+ β [ 4, β ) givenbyf (x) = x2
+ 4. Show that f isinvertiblewiththe inverse f-1
of f givenbyf-1
(y) =
β π¦ β 4 , where R+ isthe set of all non β negative real numbers.
115. Usingpropertiesof determinants,prove the following:- |
π₯ π₯ + π¦ π₯ + 2π¦
π₯ + 2π¦ π₯ π₯ + π¦
π₯ + π¦ π₯ + 2π¦ π₯
| = 9y2
( x + y) .
116. Findthe value of k, forwhich f(x) = {
β1+ππ₯β β1βππ₯
π₯
, ππ β 1 β€ π₯ < 0
2π₯+1
π₯β1
, ππ 0 β€ π₯ < 1
is continuousatx = 0.
117. If x = a cos3
ο± andy = a sin3
ο±,thenfindthe value of
π2 π¦
ππ₯2
at ο± =
π
6
.
118. Evaluate :- β«
cos2π₯βcos2πΌ
cosπ₯βcosπΌ
dx .
119. Evaluate :- β«
π₯+2
βπ₯2+ 2π₯+3
dx.
120. Evaluate :- β«
1
1+ πsinπ₯
2π
0 dx.
121. Findthe particularsolutionof the differential equation(tan -1
yβ x) dy= ( 1 + y2
) dx,giventhatwhenx = 0, y=0 .
122. Show that the differential equation [π₯ π ππ2 (
π¦
π₯
) β π¦] dx + x dy= 0 ishomogeneous.Findthe particularsolution
of thisdifferential equation,giventhaty=
π
4
whenx = 1.
123. Evaluate :- β«
π₯2+ 1
( π₯+1)2
π π₯ ππ₯.
124. Findthe equationsof the normalstothe curve y = x3
+ 2x + 6 whicha re parallel tothe line x + 14y + 4 = 0.
125. If πβ = πΜ + πΜ + πΜ , πββ = 4 πΜ β 2πΜ + 3πΜ πππ πβ = πΜ β 2πΜ + πΜ, finda vectorof magnitude 6 unitswhichisparallel
to the vector2 πβ - πββ + 3 πβ.
126. Let πβ = πΜ + 4πΜ + 2πΜ , πββ = 3 πΜ β 2πΜ + 7πΜ πππ πβ = 2πΜ β πΜ + 4πΜ, finda vector πβ whichisperpendicularto
both πβ πππ πββ and πβ . πβ = 18.
127. Findthe area of the greatestrectangle thatcan be inscribedinanellipse
π₯2
π2
+
π¦2
π2
= 1.
7. 128. A square tankof capacity250 cubicmetershas to be dug out.The cost of the landis Rs.50 persquare meter.
The cost of diggingincreaseswiththe depthandforthe whole tank,itisRs.( 400 x h2
),where hmetersisthe
depthof the tank. What shouldbe the dimensionsof the tanksothat the cost id minimum?
129. Findthe area of the region{ (x,y) : y2
ο£ 6ax andx2
+ y2
ο£ 16a2
} usingmethodof integration.
130. Findthe area of the regionboundedbythe parabolay= x2
and y = | π₯|
131. Findthe vectorequationof the plane throughthe points( 2, 1, -1) and ( -1, 3, 4) andperpendicularto the plane
x β 2y + 4z = 10.
132. Showthat the lines πβ = ( πΜ+ πΜ β πΜ ) + ο¬ ( 3πΜ β πΜ ) and πβ = (4 πΜ β πΜ ) + ο ( 2πΜ + 3πΜ ) are coplanar.Also,find
the plane containingthese twolines.
133. If y =
sinβ1 π₯
β 1β π₯2
, showthat ( 1 β x2
)
π2 π¦
ππ₯2
β 3π₯
ππ¦
ππ₯
β π¦ = 0
134. Differentiate tan-1 [
β1+ π₯2β β1β π₯2
β1+ π₯2+ β1β π₯2
] withrespecttocos-1
x2
.
135. The functionf(x) isdefinedasf(x) = {
π₯2 + ππ₯ + π, 0 β€ π₯ < 2
3π₯ + 2, 2 β€ π₯ β€ 4
2ππ₯ + 5π, 4 < π₯ β€ 8
.
136. Findthe equationof tangentandnormal to the curve y =
π₯β7
( π₯β2)(π₯β3_
at the pointwhere itcuts the x β axis.
137. VerifyRolleβstheoremforfunctionf,givenbyf(x)=ex
( sin x β cos x) on [
π
4
5 π
4
] .
138. Showthat sin[ cot-1
{ cos ( tan-1
x)}] = β
π₯2+ 1
π₯2+ 2
.
139. Prove that the functionf : N β N, definedbyf(x)=x2
+ x + 1 is one β one but not onto.
140. Solve forx : 3 sin-1
(
2π₯
1+ π₯2
) β 4 cosβ1 (
1β π₯2
1+ π₯2
) + 2 tanβ1(
2π₯
1β π₯2
) =
π
3
141. .Evaluate :- β«
π₯3+ π₯+1
π₯2β 1
dx.
142. Evaluate :- β«
2π₯
( π₯2+ 1)( π₯2+ 2)
dx.
143. Evaluate :- β«
π₯sin π₯
1+ πππ 2 π₯
π
0 dx.
144. Evaluate :- β« log( 1 + tan π₯) ππ₯
π
4
0 , usingpropertiesof definite
145. There isa groupof 50 people whoare patrioticoutof which20 believe innon βviolence.Twopersonsare
selectedatrandomoutof them,write the probabilitydistributionforthe selectedpersonswhoare non β violent.
Alsofindthe meanof the distribution
146. Showthat the differential equationx
ππ¦
ππ₯
sin (
π¦
π₯
) + π₯ β π¦ sin (
π¦
π₯
) = 0 ishomogeneous.Findthe particular
solutionof thisdifferential equation,giventhatx = 1 wheny =
π
2
.
147. If the sumof twounitvectorsis a unitvector,show that the magnitude of theirdifference is β3 .
148. Usingpropertiesof determinants,prove the following:-
8. |
3π₯ βπ₯ + π¦ βπ₯ + π§
π₯ β π¦ 3π¦ π§ β π¦
π₯ β π§ π¦ β π§ 3π§
| = 3( π₯ + π¦ + π§)(π₯π¦ + π¦π§ + π§π₯) .
149. Solve the differential equation:- (1+ y + x2
y) dx + (x + x3
)dy= 0, where y= 0 whenx = 1.
150. Findthe distance betweenthe pointP(5,9) and the plane determinedbythe pointsA(3, -1,2), B(5, 2, 4) and
C( -1, -1, 6).
151. Findthe equationof the perpendiculardrawnfromthe point P( 2, 4, -1) to the line
π₯+5
1
=
π¦+3
4
=
π§β6
β9
. Also,
write downthe coordinatesof the footof the perpendicularfromPtothe line.
152. Findthe vectorand Cartesianequationof the plane containingthe twolines:-
πβ = (2 πΜ + πΜ β 3πΜ ) + ο¬ ( πΜ + 2πΜ + 5πΜ) and πβ = (3 πΜ + 3πΜ + 2 πΜ ) + ο ( 3πΜ β 2πΜ + 5πΜ )
153. In answeringaquestiononaMCQ testwith4 choicesperquestion,astudentknowsthe answer,guessesor
copiesthe answer.LetΒ½ be the probabilitythathe knowsthe answer,ΒΌ be the probabilitythathe guessesandΒΌ
that he copiesit.Assuming thata student,whocopiesthe answer,will be correctwiththe probabilityΒΎ,what is
the probabilitythatthe studentknowsthe answer,giventhathe answereditcorrectly?
154. If A = [
1 2 β3
2 3 2
3 β3 β4
], findA-1
. hence ,solve the followingsystemof equation: x + 2y β 3z = -4, 2x + 3y + 2z = 2,
3x β 3y β 4z = 11.
155. Prove that the radiusof the basof rightcircular cylinderof greatest curvedsurface areawhichcanbe inscribed
ina givencone ishalf thatof the cone.
156. Findthe area of the regionenclosedbetweenthe twocircles
x2
+ y2
= 1 and ( x β 1)2
+ y2
= 1.
157. One kindof cake requires300 g of flourand15g of fat,anotherkindof cake requires150g of flourand30g of
fat.Findthe maximumnumberof cakeswhichcanbe made from 7.5kg of flourand600g of fat, assumingthat
there isno shortage of the otheringredientsusedinmakingthe cakes.Make itas an LPPand solve itgraphically.
158. Usingpropertiesif determinants,solve the followingforx : |
π₯ β 2 2π₯ β 3 3π₯ β 4
π₯ β 4 2π₯ β 9 3π₯ β 16
π₯ β 8 2π₯ β 27 3π₯ β 64
| = 0
159. Findthe relationshipbetweenβaβandβbβso that the functionβfβdefinedby:
f(x) = {
ππ₯ + 1, ππ π₯ β€ 3
ππ₯ + 3, ππ π₯ > 3
is continuousatx = 3.
160. If xy
β ex β y
, showthat
ππ¦
ππ₯
=
πππ π₯
{log( π₯π)}2
.
161. If πΜ + πΜ + πΜ , 2πΜ + 5πΜ , 3πΜ + 2πΜ β 3πΜ and πΜ β 6πΜ β πΜ are the positionvectorsof the pointsA,B, C andD, find
the angle between π΄π΅ββββββ and πΆπ·ββββββ . Deduce that π΄π΅ββββββ and πΆπ·ββββββ are collinear.
9. 162. The radiusof a spherical diamondismeasuredas7 cm withan error of 0.04 cm. Findthe approximate errorin
calculatingitsvolume.If the costof 1 cm3
diamondisRs.1000, what isthe lossto the buyerof the diamond?
What lessonyouget?
163. Evaluate :- β«(5π₯ β 1)β6 + 5π₯ β 2π₯2 dx.
164. Evaluate :- β«
π₯+sin π₯
1+cosπ₯
π
2
0 dx .
165. Evaluate :- β«
π₯sin π₯ cosπ₯
π ππ4 π₯+ πππ 4 π₯
π
2
0 dx.
166. Evaluate :- β«
π₯2+ 1
( π₯β1)2 ( π₯+3)
dx.
167. Prove the following: cos(sinβ1 3
5
+ cotβ13
2
) =
6
5β13
.
168. Solve the differential equation:- (y+ x)
ππ¦
ππ₯
= π¦ β π₯ .
169. A companyhas twoplantsto manufacture motorcycles.70%motorcyclesare manufacturedatthe firstplant,
while 30%are manufacturedatthe secondplant.At the firstplant,80% motor cyclesare rated of the standard
qualitywhile atthe secondplant,90%are ratedof standardquality.A motorcycle,randomlypickedup,isfound
to be of standard quality.Findthe probabilitythatithascome outfrom the secondplant.
The probabilitythata studententeringauniversitywill graduate is0.4.findthe probabilitythatoutof 3
studentsof the university:
170. Findthe area of the region{(x,y):y2
ο£ 4x , 4x2
+ 4y2
ο£ 9}.
171. Showthat the altitude of the rightcircularcone of maximumvolume thatcanbe inscribedina sphere of radiusr
is
4π
3
.
172. If the sumof the lengthsof the hypotenuse andaside of a righttriangle isgiven,show thatthe area of the
triangle ismaximumwhenthe angle betweenthemis
ο°
3
.
173. Findthe vectorequationof a line passingthroughthe pointwithpositionvector( 2πΜ β 3πΜ β 5πΜ ) and
perpendiculartothe plane πΜ . ( 6πΜβ 3πΜ β 5πΜ ) + 2 = 0 . also,findthe pointof intersectionof thislineandthe
plane.
174. A retiredpersonhasRs.70,000 to investandtwotypesof bondsare available inthe marketforinvestment.First
type of bondsyieldsanannual income of 8% on the amountinvestedandthe secondtype of bondyields10%per
annum.Aspee norms,he has to investaminimumof Rs.10,000 inthe firsttype and notmore thanRs. 30,000 in
the secondtype.Howshouldhe planhisinvestment,soasto get maximumreturn,afterone yearof investment?
175. Findthe equationof the plane passingthroughthe point(1,1, 1) and containingthe line
πβ = ( β3πΜ + πΜ + 5πΜ ) + ο¬ ( 3πΜ β πΜ β 5πΜ ) . Also,show thatthe plane containsthe lines
πβ = ( βπΜ+ 2πΜ + 5πΜ ) + ο ( πΜ β 2πΜ β 5πΜ ) .
10. 176. Usingpropertiesof determinants,prove that: |
π + π π π
π π + π π
π π π + π
| = 4abc.
177. Findthe value of βaβ forwhichthe functionf definedasf(x) = {
π sin
π
2
( π₯ + 1), π₯ β€ 0
tanπ₯βsinπ₯
π₯3
, π₯ > 0
iscontinuousatx=0.
178. Differentiate xx cos x
+
π₯2+ 1
π₯2β 1
w.r.t. x.
179. Findthe intervalsin whichf(x) =sinx β cosx, 0 ο£ x ο£ 2ο° isstrictlyincreasingorstrictlydecreasing.
180. Solve forx : tanβ1 (
π₯β1
π₯β2
) + tanβ1 (
π₯+ 1
π₯+2
) =
π
4
.
181. Evaluate :- β«
π πππ₯+cosπ₯
β π πππ₯cosπ₯
dx
182. Evaluate :- β« | π₯cos(ππ₯)|
1
2
β1 ππ₯.
183. If πβ , πββ πππ πβ are three unitvectorssuchthat πβ . πββ = πβ πβ = 0 andangle between πββ πππ πβ is
π
6
,prove that
πβ = ο± 2( πββ ο΄ πβ) .
184. A coinis biasedsothatthe headis3 timesaslikelytooccur as tail.If the coin istossedthree times,findthe
probabilitydistributionof numberof tails.
185. Findthe lengthandthe equationof the line of shortestdistance betweenthe lines:
π₯β3
3
=
π¦β8
β1
=
π§β3
1
and
π₯+3
β3
=
π¦+7
2
=
π§β6
4
186. Showthat of all the rectanglesinscribedinagivenfixedcircle,the square hasthe maximumarea.
187. Usingintegrationfindthe areaof the triangularregionwhose sides are y = 2x + 1, y = 3x + 1 andx = 4.
188. A factorymakestennisracketsandcricketbats. A tennisrackettakes1.5 hoursof machine time and3 hours of
craftsmanβstime initsmakingwhile acricketbat takes3 hoursof machine time time and1 hour of craftsmanβs
time.Ina day, the factory has the availabilityof notmore than42 hoursof machine time and24 hoursof
craftsmanβstime.If the profitona racket and on a bat isRs. 20 and Rs. 10 respectively,findthe numberof tennis
racketsand cricketbats that the factorymust manufacture toearn the maximumprofit.Make itas an LPPand
solve graphically
189. Suppose 5%of menand 0.25% of womenhave greyhair.A greyhairedpersonisselectedatrandom.Whatisthe
probabilityof thispersonbeingmale?Assume thatthere are equal numberof malesandfemales?
190. A man isknownto speaktruth3 outof 4 times.He throwsa die andreportsthat it isa six.Findthe probability
that itis actually.Isit possible tospeaktruthineachand everycase?
191. Three friendsA,Band C visitedaSuperMarket forpurchasingfreshfruits.A purchased1 kg apples,3 kggrapes
and 4 kgorangesand paidRs. 800. B purchased2 kg apples,1kg grapesand 2kg orangesand paidRs. 500, while
C paidRs. 700 for5 kg apples,1 kggrapes and1 kg oranges.Findthe cost of each fruitperkg by matrix method.
Why fruitsare good forhealth?
192. Prove that tanβ1 (
cosπ₯
1+sin π₯
) =
π
4
β
π
2
, π₯ β (β
π
2
,
π
2
) .
11. 193. Let A = R β {3} and B = R β {1} . considerthe functionf :A β B definedbyf(x)=(
π₯ β 2
π₯β3
) . Show that f isone -one
and ontoand hence findf-1
.
194. If y = cosec -1
x, x > 1, thenshow: x ( x2
β 1)
π2 π¦
ππ₯2
+ ( 2π₯2 β 1)
ππ¦
ππ₯
= 0 .
195. Usingproperties, prove that |
π + π π + π π¦ + π§
π + π π + π π§ + π₯
π + π π + π π₯ + π¦
| = 2 |
π π π₯
π π π¦
π π π§
| .
196. If ( cos x)y
= (cos y) x
, find
ππ¦
ππ₯
.
197. If sin y = x sin( a + y),prove that
ππ¦
ππ₯
=
π ππ2 ( π+π¦)
sinπ
.
198. Showthat the curves2x = y2
and2xy = k cut eachat right anglesif k2
= 8.
199. For the curve y = 4x3
β 2x5
, findall pointsatwhichthe tangentpassesthroughthe origin.
200. Prove that β« ( βtan π₯ + βcotπ₯ ) ππ₯ = β2 .
π
2
π
4
0 .
201. If πβ , πββ πππ πβ are three unitvectorssuchthat | πβ| = 5, | πββ| = 12 and | πβ| = 13 , and πβ + πββ + πβ= 0ββ , findthe value
of πβ . πββ + πββ . πβ+ πβ . πβ .
202. Evaluate :- β« ( 2π₯2 + 5π₯ ) ππ₯
3
1 as a limitof a sum.
203. Evaluate :- β« sin π₯sin 2π₯ sin 3π₯ ππ₯ .
204. Evaluate :- β«
2
( 1βπ₯)( 1+ π₯2 )
dx
205. Findthe particularsolutionof the differential equation:- 2xy+ y2
β 2x2 ππ¦
ππ₯
= 0 . Giventhaty = 2 whenx =1.
206. Evaluate :- β«
log(1+π₯)
1+ π₯2
1
0 dx
207. An aeroplane cancarry a maximumof 200 passengers.A profitof Rs.1000 is made on eachexecutive classticket
and a profitof Rs. 600 ismade on eacheconomyclassticket.The airline reservesatleast20 seatsfor executive
class.However,atleast4 timesas manypassengersprefertotravel byeconomyclassthanby the executiveclass.
Determine howmanyticketsof eachtype mustbe soldinorderto maximise the profitforthe airline.Whatisthe
maximumprofit?.
208. Showthat the semi β vertical angle of the rightcircular cone of giventotal surface area andmaximumvolume is
sin-1 1
3
.
209. Two bagsA and B contain4 white and3 blackballsand2 white and2 blackballsrespectively.FrombagA,two
ballsare drawn at randomand thentransferredtobag B. A ball isthendrawnfrombag B and isfoundto be a
blackball.What isthe probabilitythatthe transferredballswere 1white and1 black?
210. Usingthe methodof integration,findthe areaof the regionboundedbythe lines: 2x + y = 4, 3x β 2y = 6, x β 3y
+ 5 = 0.
211. Findthe equationof plane passingthroughthe point(1,2, 1) and perpendiculartothe line joiningthe points(1,
4, 2) and( 2, 3, 5) . Also,findthe perpendiculardistance of the plane fromthe origin.
12. 212. Use product[
1 β1 2
0 2 β3
3 β2 4
] [
β2 0 1
9 2 β3
6 1 β2
] tosolve the equations: x β y+ 2z = 1, 2y β 3z = 1, 3x β 2y + 4z = 2
213. Findthe shortestdistance betweenthe lines:
πβ = 6πΜ + 2πΜ + 2πΜ + ο¬ ( πΜ β 2πΜ + 2πΜ ) πππ πβ = β4πΜβ πΜ + ο (3 πΜ β 2πΜ β 2πΜ ) .
214. Evaluate β« ( π₯2 β π₯)
4
1 dx as a limitof sums.
215. Evaluate :- β«
sinπ₯+cosπ₯
9+16sin 2 π₯
π
4
0 dx
216. Evaluate :- β« π2π₯ sin π₯ ππ₯ .
217. Evaluate :- β« | π₯3 β π₯|
2
1 dx
218. Evaluate :- β« log( 1 + tan π₯)
π
4
0 dx
219. Two cards are drawnsimultaneously( withoutreplacement) fromawell βshuffledpackof 52 cards. Findthe
meanand variance of the numberof red cards?
220. If x = a ( cos t + t sint) and y = a (sint β t cos t), 0 < t <
π
2
, ππππ
π2 π₯
ππ‘2
,
π2 π¦
ππ‘2
πππ
π2 π¦
ππ₯2
.
221. If x = β πsinβ1 π‘ , π¦ = β πcosβ1 π‘ , π βππ€ π‘βππ‘
ππ¦
ππ₯
= β
π¦
π₯
.
222. Prove that :-
π
ππ₯
[
π₯
2
βπ2 β π₯2 +
π2
2
sinβ1 (
π₯
π
)] = βπ2 β π₯2 .
223. If any three vectors πβ , πββ and πβ are coplanar,prove that the vectors πβ + πββ , πββ + πβ and πβ + πβ are also
coplanar.
224. The two equal sidesof anisoscelestriangle withfixedbase bare decreasingatthe rate of 3 cm persecond.How
fastis the area decreasingwhenthe twoequal sidesare equal tothe base?
225. Showthat the curvesy = aex
and y = be-x
cut at right anglesif ab= 1.
226. Showthat the relationRon Z definedby(a,b) ο R ο a β b is divisible by5is an equivalence relation.
227. Showthat sinβ1 12
13
+ cosβ1 4
5
+ tanβ1 63
16
= π .
228. Findwhetherthe lines πβ = ( πΜ β πΜ β πΜ ) + ο¬ ( πΜ + πΜ ) and πβ = ( 2πΜ β πΜ ) + ο ( πΜ + πΜ β πΜ ) intersectornot.If
intersecting,findtheirpointof intersection.
229. Findthe coordinatesof the footof the perpendiculardrawnfromthe pointA (1, 8, 4) to the line joiningthe
pointB (0, -1, 3) and C ( 2, -3, -1).
230. Usingintegration,find the areaof the region
{ (x,y) : | π₯ β 1| β€ π¦ β€ β5 β π₯2 } .
231. A square tankof capacity250 cubicmetreshas to be dug out.The cost of the landis Rs.50 persquare metre.
The cost of diggingincreaseswiththe depthandforthe whole tank,itisRs.( 400 x h2
),where hmetres is the
depthof the tank. What shouldbe the dimensionsof the tanksothat the cost is minimum?
13. 232. If A = [
4 β5 β11
1 β3 1
2 3 β7
] , findA-1
. hence solve the equations: 4x β 5y β 11z = 12, x β 3y + z = 1, 2x + 3y β 7z = 2
233. In answeringaquestiononamultiple choice test,astudenteitherknowsthe answerorguesses.LetΒΎbe the
probabilitythathe knowsthe answerandΒΌ be the probabilitythathe guesses.Assumingthatastudentwho
guessesatthe answerwill be correctwithprobability ΒΌ .What isthe probabilitythatthe studentknowsthe
answergiventhathe answereditcorrectly?
234. Findthe vectorequationof the line passingthroughthe point(2,3, 2) and parallel tothe line
πβ = (β2 πΜ + 3πΜ) + ο¬ (2 πΜβ 3 πΜ + 6 πΜ) . Alsofindthe distance betweenthe lines.
235. Evaluate : β« 2 sin π₯cos π₯ tanβ1(sin π₯) ππ₯
π
2
0 .
236. Evaluate :- β«
π₯3β 1
π₯3+ π₯
dx
Evaluate :- β« π₯2 tanβ1 π₯ ππ₯ .
237. If tanβ1 π₯β1
π₯β2
+ tanβ1 π₯+1
π₯+2
=
π
4
, thenfindthe value of x.
238. Prove that |
π₯ π₯2 1 + ππ₯3
π¦ π¦2 1 + ππ¦3
π§ π§2 1 + ππ§3
| = (1 + pxyz) (x β y) ( y β z) (z β x) .
239. Findthe value of k for whichf(x) = {
log(1+ππ₯)βlog(1βππ₯)
π₯
, ππ π₯ β 0
π ππ π₯ = 0
240. If y = (x)sin x
+ (sinx)x
, find
ππ¦
ππ₯
.
241. If y = π π cosβ1 π₯ [cos π₯ log π₯ +
sin π₯
π₯
] + (sin π₯) π₯ [logsin π₯ + π₯cot π₯] .
242. If x = a [cos π‘ + log |tan
π‘
2
|] πππ π¦ = π sin π‘ π‘βππ ππππ
ππ¦
ππ₯
ππ‘ π‘ =
π
4
.
Usingdifferentials,findthe approximatevalue of β25.2 .
243. Considerf : R+ β [ 4,β] givenbyf(x) = x2
+ 4. Show that f is invertible withthe inverse( f-1
) of f givenbyf-1
(y) =
β π¦ β 4 , where R+ is the setof all non β negative real numbers.
244. Usingpropertiesof definite integrals,evaluate : β«
π₯ ππ₯
25 π ππ2 π₯+16 πππ 2 π₯
π
0 .
245. Evaluate :- β«
π₯ tan π₯
sec π₯+tanπ₯
π
0 dx
246. The dot product of a vector withthe vectors2πΜ + 3πΜ + πΜ , 4πΜ + πΜ and πΜ β 3πΜ β 7πΜ are respectively9,7 and6.
Findthe vector.
247. Findthe image of point(1, 6, 3) inthe line
π₯
1
=
π¦β1
2
=
π§β2
3
.
Findthe vectorequationof the plane passingthroughthe points 2πΜ + πΜ β πΜ and -πΜ+ 3πΜ + 4 πΜ and
perpendiculartothe plane πβ . ( πΜβ 2πΜ + 4πΜ ) = 10.
248. Findthe distance of the point(3, 4, 5) from the plane x + y + z = 2 measuredparalleltothe line 2x = y = z.
14. 249. Given, the curvedsurface of a rightcircularcone.Show that whenthe volume of the cone ismaximum,thenthe
heightof the cone is equal to β2 timesthe radiusof the base.
250. For the matrix A = [
1 1 1
1 2 β3
2 β1 3
] showthat A3
β 6A2
+ 5A + 11I = 0 . hence findA -1
.
251. In a competitive examination,anexamineeeitherguessesorcopiesknowsthe answertoamultiple choice
questionwithfourchoices.The probabilitythathe makesa guessis1/3 and the probabilitythathe copiesthe
answeris1/6. The probabilitythatthe answeriscorrect,giventhathe copiedit,is1/8. Findthe probabilitythat
he knowsthe answerto the question,giventhathe correctlyansweredit.Whycopyingispunishable butguess
workis not? explain.
252. Of the studentsina college,itknownthat 60% reside inhostel and40% are day scholars( not residinginhostel).
Previousyearresultsreportthat30% of the studentswhoreside inhostelattainβAβgrade and20% of day
scholarsattainβAβgrade intheirannual examination.Atthe endof the year,one studentischosenat random
fromthe college andhe hasan βAβgrade,what isthe probabilitythatthe studentisa hostlier?
253. Usingthe methodof integration,findthe areaof the regionboundedbythe lines3x β 2y + 1 = 0, 2x + 3y β 21 = 0
and x β 5y + 9 = 0.
254. Prove that :- β« sinβ1 (β
π₯
π+π₯
)
π
0 ππ₯ =
π
2
( π β 2).
255. Evaluate :- β«
1
π πππ₯ ( 5β4cosπ₯)
dx
256. Evaluate :- β« β
1β β π₯
1β β π₯
dx
257. Solve forx : 2 tan-1
( sinx) = tan-1
(2 sec x),0 < x <
π
2
.
258. Solve forx : tan -1
( x + 1) + tan-1
(x β 1) = tan-1 8
31
.
259. If β1 β π₯2 + β1 β π¦2 = π( π₯ β π¦), ππππ£π π‘βππ‘
ππ¦
ππ₯
= β
1β π¦2
1β π₯2
.
260. If y = (x + β π₯2 β 1 )m
, thenshowthat (π₯2 β 1)
π2 π¦
ππ₯2
= x
ππ¦
ππ₯
- m2
y = 0.
261. Showthat the relationRin the setA = { x : x ο Z, 0 ο£ x ο£ 12} givenbyR = {(a,b) : | π β π| iseven} is an
equivalence relation.Findthe setof elementsrelatedto1.
262. Solve the followingdifferential equation:
ππ¦
ππ₯
+ y cot x = 4x cosec x , giventhaty = 0 whenx =
π
2
.
263. The probabilityof twostudentsA andB comingto the school intime are
3
7
and
5
7
respectively.Assumingthat
the events,βA comingintimeβandβB comingintimeβare independent,findthe probabilityof onlyone of them
comingto the school intime.
264. Findthe meannumberof headsinthree tossesof a faircoin.
15. 265. Usingpropertiesof determinants,showthat |
3π βπ + π βπ + π
π β π 3π π β π
π β π π β π 3π
| = 3 (a + b + c)(ab + bc + ca).
266. Showthat the function: f(x) =cot -1
( sinx + cos x) isa strictlydecreasingfunctioninthe interval (0,
π
4
) .
267. Findthe intervalsin whichthe functionf givenbyf(x) =x3
+
1
π₯3
, π₯ β 0 is (i) increasing (ii) decreasing.
268. Evaluate :- β«
π ππ2 π₯
sinπ₯+πππ π₯
π
2
0 dx .
269. If πβ , πββ and πβ are mutuallyperpendicularvectorsof equal magnitudes,show thatthe vector πβ + πββ + πβ is
equallyinclinedto πβ πββ πππ πβ .
270. A manufacturerproducespizzaandcakes.Ittakes1 hour of work onmachine.A and 3 hourson machine Bto
produce a packetof pizza.Ittakes3 hours onmachine A and 1 hour onmachine B to produce a packetof cakes.
He earnsa profitof Rs. 17.50 perpacket onpizzaand Rs. 7 perpacketof cake.How manypacketsof each should
be producedeachday so as to maximize hisprofitsif he operateshismachinesforatthe most 12 hoursa day?
271. A helicopterif flyingalongthe curve y= x2
+ 2. A soldierisplacedatthe point(3,2) . findthe nearestdistance
betweenthe soliderandthe helicopter.
272. Findthe area of the smallerregionboundedbythe ellipse
π₯2
π2
+
π¦2
π2
= 1 and the line
π₯
π
+
π¦
π
= 1 .
273. Solve the systemof the followingequations:
2
π₯
+
3
π¦
+
10
π§
= 4 ,
4
π₯
β
6
π¦
+
5
π§
= 1,
6
π₯
+
9
π¦
-
20
π§
= 2
274. Findthe equationof the plane whichcontainsthe twoparallel lines :
π₯β3
3
=
π¦+4
2
=
π§β1
1
and
π₯+1
3
=
π¦β2
2
=
π§
1
.
275. Findthe equationof the plane passingthroughthe line of intersectionof the planes πβ = ( πΜ + 3πΜ) - 6 = 0 and πβ
= (3 πΜ β πΜ β 4 πΜ) = 0, whose perpendiculardistance fromoriginisunity.
276. Prove that 2 tan-1
(
1
5
) + secβ1 (
5β2
7
) + 2 tanβ1 (
1
8
) =
π
4
.
277. Solve forx : tan -1
( x - 1) + tan-1
x + tan-1
(x + 1) = tan-1
3x .
278. If x = sint , y = sinpt,prove that ( 1 β π¦2)
π2 π¦
ππ₯2
= x
ππ¦
ππ₯
+ p2
y= 0.
279. Evaluate :- β« β
1+π₯
π₯
dx
280. Usingpropertiesof determinants,prove the following:- |
βπ¦π§ π¦2 + π¦π§ π§2 + π¦π§
π₯2 + π₯π§ βπ₯π§ π§2 + π₯π§
π₯2 + π₯π¦ π¦2 + π₯π¦ βπ₯π¦
| = ( xy + yz + zx)2
.
281. Evaluate :- β« π₯ tanβ1 π₯ dx .
282. Evaluate :- β«
ππ₯
π πππ₯β sin2π₯
dx
16. 283. If πβ , πββ πππ πβ are three unitvectorssuchthat πβ . πββ = πβ πβ = 0 andangle between πββ πππ πβ is
π
6
,prove that
πβ = ο± 2( πββ ο΄ πβ) .
284. β«
π₯ sinπ₯ cosπ₯
π ππ 4 π₯+ πππ 4 π₯
π
2
0 dx
285. Prove that the radiusof the rightcircularcylinderof greatestcurvedsurface areawhichcan be inscribedina
givencone ishalf of that of the cone.
286. If the lengthof three sidesof trapezium, otherthanthe base,are equal to10cm, thenfindthe area of the
trapezium whenitismaximum.
287. Findthe distance of the point(-1, -5, -10) from the pointof intersectionof the line πβ = (2 πΜ β πΜ + 2 πΜ) + ο¬
(3 πΜ + 4 πΜ + 2 πΜ) and the plane πβ. ( πΜβ πΜ + πΜ) = 5.
288. Showthat the lines:- πβ = ( πΜ + πΜ β πΜ ) + ο¬ (3 πΜ β πΜ ) and πβ = ( 4πΜ β πΜ ) + ο (2 πΜ+ 3 πΜ ) are coplanar.Also,
findthe equationof the plane containingboththeselines.
289. A toycompanymanufacturestwotypesof dollsA and B. markettestsand available resourceshave indicated
that the combinedproductionlevelshouldnotexceed1200 dollsperweekandthe demandfordollsof type B is
at most half of that for dollsof type A.further,the productionlevel of dollsof type A canexceedthree timesthe
productionof dollsof othertype byat most 600 units.If the companymakesprofitof Rs.12 andRs 16 perdoll
respectivelyondollsA andB,how manyof eachshouldbe producedweeklyinordertomaximise the profit?
290. Differentiate cos-1
{
1β π₯2
1+ π₯2
} withrespectof tan-1
{
3π₯ β π₯3
1β3 π₯2
} .
291. If y = xx
,prove that
π2 π¦
ππ₯2
-
1
π¦
(
ππ¦
ππ₯
)
2
β
π¦
π₯
= 0
292. Showthat the function: f(x) =cot-1
( sinx + cos x) is a strictlydecreasingfunctioninthe interval (0,
π
4
) .
293. Findthe pointsonthe curve x2
+ y2
β 2x β 3 = 0 at whichthe tangentsare parallel tox β axis.
294. Solve forx : tan-1
(x + 1) + tan-1
(x β 1) = tan-1 8
13
.
295. Showthat the relationRin te setA = { x : x ο Z, 0 ο£ x ο£ 12 } givenbyR = {(a,b) : | π β π| is even} isanequivalence
relation.Findthe setof elementsrelatedto1.
296. Showthat the cone of the greatestvolume whichcanbe inscribedinagivensphere hasanaltitude equal to2/3
of the diameterof the sphere.
297. A windowhasthe shape of a rectangle surmountedbyanequilateraltriangle.If the perimeterof the window is
12 m, findthe dimensionsof the rectangle thatwill produce the largestareaof the window.
298. Findthe area boundedbythe curves(x β 1)2
+ y2
= 1 and x2
+ y2
= 1.
299. A card from a pack of 52 playingcardsislost.From the remainingcardsof the pack three cards are drawnat
random( withoutreplacement) andare foundtobe all spades.Findthe probabilityof the lostcardbeingspade.
300. Findthe coordinatesof the footof the perpendiculardrawnfromthe pointA (1, 8, 4) to the line joiningthe
pointB (0, -1, 3) and C ( 2, -3, -1)