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Mathematics (from Greek μάθημα máthēma, “knowledge, study, learning”) is the study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics
Growth of Functions
CMSC 56 | Discrete Mathematical Structure for Computer Science
October 6, 2018
Instructor: Allyn Joy D. Calcaben
College of Arts & Sciences
University of the Philippines Visayas
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Growth of Functions
CMSC 56 | Discrete Mathematical Structure for Computer Science
October 6, 2018
Instructor: Allyn Joy D. Calcaben
College of Arts & Sciences
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CMSC 56 | Discrete Mathematical Structure for Computer Science
October 13, 2018
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CMSC 56 | Discrete Mathematical Structure for Computer Science
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THE BINOMIAL THEOREM shows how to calculate a power of a binomial –
(x+ y)n -- without actually multiplying out.
For example, if we actually multiplied out the 4th power of (x + y) --
(x + y)4 = (x + y) (x + y) (x + y) (x + y)
-- then on collecting like terms we would find:
(x + y)4 = x4 + 4x3y + 6x2y2 + 4xy3 + y4 . . . . . (1)
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
1.4 modern child centered education - mahatma gandhi-2.pptx
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2. Problems:
Cooperation policy. You are encouraged to work with others, but the final writeup must be
entirely your own and based on your own understanding. You may not copy another
student’s solutions. And you should not refer to notes from a study group while writing up
your solutions (if you need to refer to notes from a study group, it isn’t really “your own
understanding”).
Part I. These problems are mostly from the textbook and reinforce the basic techniques.
Occasionally the solution to a problem will be in the back of the textbook. In that case, you
should work the problem first and only use the solution to check your answer.
Part II. These problems are not taken from the textbook. They are more difficult and are
worth more points. When you are asked to “show” some fact, you are not expected to
write a “rigorous solution” in the mathematician’s sense, nor a “textbook solution”.
However, you should write a clear argument, using English words and complete
sentences, that would convince a typical Calculus student. (Run your argument by a
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sake, try to keep your answers as short as possible (but don’t leave out important steps).
Problem 1(5 points) Find the equation of the tangent line to the graph of y = e571x
containing the point (102π, 0). (This is not a point on the graph; it is a point on the
tangent line.)
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3. Problem 2
(a)What does the chain rule say if y = xa and u = yb ? The constants a and b are fractions.
(b)Using the chain rule, give a very short explanation of the formula from Problem 3, Part II
of Problem Set 1.
Problem 3 A bank offers savings accounts and loans. For an initial deposit of A dollars in
savings account with continuously compounded interest at an annual rate a, after t years
the bank owes the customer A(1 + a)t dollars (neglecting fees). For an initial loan of B
dollars with continuously compounded interest at an annual rate b, after t years the
customer owes the bank B(1+b)t dollars (neglecting fees). To make a profit, the bank sets
rate b, the interest rate for loans, higher than rate a, the interest rate for savings. To
simplify computations, introduce α = ln(1 + a) and β = ln(1 + b).
Customer 1 deposits A dollars in a savings account. The bank immediately loans a smaller
amount of B dollars to Customer 2. After t years, the bank’s net gain from the two
transactions together is,
In the long run, which is to say, when t is very large, G(t) is positive and the bank has
made a gain. However, for t small, G(t) is negative and the bank has a net liability
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4. The liability for the savings account alone is
In these equations, A, B, α and β are positive constants, and t is the independent
variable. (a)(5 points) Find the moment t = T when the derivative L (T) equals 0. Assume
that αA is greater than βB. Also, leave your answer in the form,
e(β−α)T = something.
Remark. After Lecture 10, we will learn that T is the moment when L(t) has its largest
value. In other words, if at time t Customer 1 withdraws all money, and Customer 2 repays
all money, the bank loses the maximum amount when t = T. (b)(5 points) Consider the
ratio L(t)/M(t). Using your answer to (a), determine L(T)/M(T). Simplify your answer as
much as possible. How does this ratio depend on the amounts A and B? Problem 4(10
points) Let A, β, ω and t0 be positive constants. Let f(t) be the function,
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5. (a) Compute f (t) and f(t). Simplify your answer as much as possible.
(b) Using your answer to (a), find nonzero constants c0, c1 and c2 for which the
function
c2f(t) + c1f(t) + c0f(t),
(a) always equals 0.
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6. Solution (a) Let u equal 8 − x2, and let v = u . Then y equals,
By the quotient rule,
By the chain rule,
When x equals 3, u equals 8−(3)2 = −1 and v equals (−1)5 = −1. Thus v(3) equals
(5(−1)4)(−2· 3) = −30. Thus, y (3) equals,
Solutions:
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7. Therefore, the slope of the tangent line at (3, −3) is,
Solution (b) Implicit differentiation gives,
By the chain rule,
By the quotient rule,
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8. Since y = (1 − x)/(1 + x), 1 + y equals,
Thus,
Therefore
So the two answers for y are equivalent.
Solution (c) The fraction simplifies,
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9. Let z equal 1/(1 + x). Then y equals 1 − z. So yequals −z . So y equals −z. Clearly, for
every positive integer n, y(n) equals −z(n) . By the same argument as in Example 2 on p.
109,
Thus, for every positive integer n,
Solution (d) The equation,
is equivalent to the equation,
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10. Subtract x from each side to get,
and then square each side to get
Expanding the lefthandside gives,
Cancelling x2 from each side gives, (
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11. Adding 2xay + 1 to each side of the equation
gives,
The expression 2ay is always nonzero. Thus it is valid to divide each side by 2ay, giving,
Of course 1/ay equals a−y. So this simplifies to,
Solution (e) Because 1/2 is less than 1, log(1/2) is less than log(1) = 0. Thus log(1/2) is
negative. For every pair of real numbers a < b and every negative number c, ac is greater
than bc, not less than bc. Therefore, the correct inequality is,
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12. The remainder of the argument is correct, and eventually leads to the true inequality,
Solution (f) By the product rule,
Let u equal −x2 and let v equal eu. Thus v equals e−x2 . By the chain
rule,
Also,
Plugging in
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13. Thus,
Solution (g) Let u equal ln(y). Then, using rules of logarithms,
Thus,
Let v equal x2 + 3. By the chain rule,
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14. Let w equal x + 5. By the chain rule,
Thus,
On the other hand,
Therefore,
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15. Solution (h) By the doubleangle formula,
cos(2φ) = (cos(φ))2 − (sin(φ))2 = 2(cos(φ))2 − [(cos(φ))2 + (sin(φ))2 ] = 2(cos(φ))2 − 1.
Substituting 2θ for φ gives,
Subsituting in cos(2θ) = 2(cos(θ))2 − 1 gives,
Solution (i) First of all, ln(x2) equals 2 ln(x).
Thus,
Let u equal 2 ln(x). Thus y equals sin(u). By the chain rule
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17. Let u equal (cos(x) + 1)/ sin(x). Then y = u2. By the chain rule,
Let v equal cos(x) + 1 and let w equal sin(x). Then u = v/w. By the quotient rule,
Also, dv/dx equals − sin(x) and dw/dx equals cos(x). Thus,
Therefore,
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18. Part II Problem 1 Find the equation of the tangent line to the graph of y = e571x containing
the point (102π, 0). (This is not a point on the graph; it is a point on the tangent line.)
Solution to Problem 1 Denote 571 by the symbol n. Denote 102π by the symbol a. The
derivative of enx equals nenx. Thus the slope of the tangent line to y = enx at the point (b,
enb) equals nenb. So the equation of the tangent line to y = enx at (b, enb) is,
If (a, 0) is contained in this line, then the equation holds for x = a and
y = 0,
Since enb is not zero, dividing by enb gives,
This can be solved to determine the one unknown in the equation, b:
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19. Substituting this in gives the equation of the tangent line to y = enx containing (a, 0),
Problem 2
(a)What does the chain rule say if y = xa and u = yb ? The constants a and b are fractions.
Solution to (a) First of all, u equals yb , which equals (xa)b . By the rules for exponents,
this equals ab x . According to the chain rule,
Substituting in y = xa gives, d
Using the rules for exponents, this equals,
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20. This is precisely what the chain rule should give, since, setting c =
ab,
(b) Using the chain rule, give a very short explanation of the formula from Problem 3, Part II of
Problem Set 1.
Solution to (b) Let u equal ax and let y equal f(u). Then y equals f(ax), which is g(x). Thus g
(x) equals dy/dx. By the chain rule,
Problem 3(10 points) A bank offers savings accounts and loans. For an initial deposit of A
dollars in a savings account with continuously compounded interest at an annual rate a,
after t years the bank owes the customer A(1 + a)t dollars (neglecting fees). For an initial
loan of B dollars with continuously compounded interest at an annual rate b, after t years
the customer owes the bank B(1+b)t dollars (neglecting fees). To make a profit, the bank
sets rate b, the interest rate for loans, higher than rate a, the interest rate for savings. To
simplify computations, introduce α = ln(1 + a) and β = ln(1 + b).
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21. Customer 1 deposits A dollars in a savings account. The bank immediately loans a
smaller amount of B dollars to Customer 2. After t years, the bank’s net gain from the two
transactions together is,
In the long run, which is to say, when t is very large, G(t) is positive and the bank has
made a gain. However, for t small, G(t) is negative and the bank has a net liability,
The liability for the savings account alone is,
In these equations, A, B, α and β are positive constants, and t is the independent
variable. (a)(5Find the moment t = T when the derivative L(T) equals 0. Assume that αA is
greater than βB. Also, leave your answer in the form,
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22. Remark. After Lecture 10, we will learn that T is the moment when L(t) has its largest
value. In other words, if at time t Customer 1 withdraws all money, and Customer 2
repays all money, the bank loses the maximum amount when t = T. Solution to (a) Using
the chain rule,
By definition of T, L (T) equals 0. Thus
Dividing each side of the equation by βBeαT
gives,
Using rules of exponents, this is
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23. It is worth remarking that to make T small, the bank may maximize the fraction B/A of
money loaned to money deposited and the bank may maximize the fraction β/α (although if
β is too high or α too low, customers are discouraged from using the bank).
(b)Consider the ratio L(t)/M(t). Using your answer to (a), determine L(T)/M(T). Simplify your
answer as much as possible. How does this ratio depend on the amounts A and B?
Solution to (b) The ratio L(t)/M(T) equals,
By the formula from the Solution to (a), e(β−α)T equals (αA)/(βB). Plugging this in,
In particular, this is
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24. Remark. From the formulas, the bank’s strategy is clear. First, adjust the ratio β/α to the
highest level allowed by law and compatible with the market’s demands. Then, for fixed α
and β, the ratio L(T)/M(T) is independent of A and B. So the maximal liability L(T) is
proportional to M(T). Since M(T) is an increasing function, the strategy is to minimize T, by
maximizing the ratio B/A. (Of course this ratio will always be less than 1, since some
fraction of all capital goes to the federal reserve, some fraction is used to cover operating
expenses, etc.)
independent of A and B. Problem 4 Let A, β, ω and t0 be positive constants. Let f(t) be the
function,
(a)(5 points) Compute f (t) and f(t). Simplify your answer as much as possible.
Solution to (a) Let s equal t − t0. Then f(t) = g(s), where,
and B = Ae−βt0 . The derivative ds/dt equals 1. Thus, according to the chain rule,
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25. Using the product rule and the chain rule, this equals,
In particular, when B equals 1, this gives,
The second derivative g(s) involves the derivative of e−βs cos(ωs), but it is also involves
the derivative of e−βs sin(ωs). Using the chain rule and the product rule,
As above,
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26. This is,
Backsubstituting s = t − t0 and Be−βs = Ae−βt gives,
and,
(b)Using your answer to (a), find nonzero constants c0, c1 and c2 for which the function
always equals 0. Solution to (b) From the Solution to (a), f (t)+βf(t) equals −Ae−βt(ω
sin(ω(t−t0))). Plugging this into the formula for f(t) gives,
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