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LATIHAN SOAL DAN PEMBAHASAN
1. Misalkan 𝑓(𝑥,𝑦) = 𝑥𝑦2
− sin⁡
(𝑥𝑦). Tentukanlah derivatif parsial fungsi tersebut?
2. Carilah turunan parsial terhadap x1 dan x2 dari fungsi
𝑦 = 𝑓(𝑥1,𝑥2) = 3𝑥1
2
+ 𝑥1𝑥2 + 4𝑥2
2
3. Tentukan
x
z


dan
y
z


dari 𝑥3
+ 𝑦3
+ 𝑧3
+ 6𝑥𝑦𝑧 = 1.
4. Tentukanlah turunan parsial 𝑧 = ln⁡
(𝑥2
+ 𝑦2
) terhadap x dan y!
5. Jika 𝑧 = 𝑥2
⁡sin⁡
(𝑥𝑦2
). Carilah
x
z


6. Tentukan turunan parsial terhadap 













z
w
y
w
x
w
z
y
x ,
,
,
, dari fungsi berikut:
𝑤 = 𝑥2
− 𝑥𝑦 + 𝑦2
+ 2𝑦𝑧 + 2𝑧2
+ 𝑧
7. Tentukan turunan parsial dari fungsi 𝑦 = 𝑥3
+ 5𝑧2
− 4𝑥2
𝑧 − 6𝑥𝑧2
+ 8𝑧 − 7.
8. Tentukan turunan parsial x dan y dari fungsi berikut: 𝑓(𝑥, 𝑦) = 𝑒𝑥𝑦
+ 𝑦 ln 𝑥
9. Tentukan semua turunan parsial orde 2 dari 𝑤 = 𝑥3
𝑦2
− 𝑥𝑦5
10. Ditentukan f(x,y,z) = xyz + 2 tan 





x
y
. Carilah turunan parsial pertamanya.
PENYELESAIAN:
1. Misalkan )
sin(
)
,
(
2
xy
y
x
f xy 
 . Tentukanlah derivatif parsial fungsi terebut!
Penyelesaian:
)
cos(
2 xy
x
xy
y
f




)
cos(
2
xy
y
x
f
y 



xy
xy
y
x
x
f
x
f
y
y
x
sin
)
cos(
2
2
2
2






 
















  )
cos(
cos
2
)
cos(
2 xy
xy
xy
y
xy
x
xy
x
y
f
x



















)
cos(
cos
2
)
cos(
2
xy
xy
xy
y
xy
y
y
x
f
y
y 







 













  xy
x
xy
x
xy
y
y
f
y
y
f
x sin
2
)
cos(
2
2
2
2





















Maka diperoleh,























x
f
y
y
f
x
2. Carilah turunan parsial terhadap x1 dan x2 dari fungsi
𝑦 = 𝑓(𝑥1,𝑥2) = 3𝑥1
2
+ 𝑥1𝑥2 + 4𝑥2
2
Penyelesaian:
Turunan terhadap x1
x
x
x
y
2
1
1
6 



Turunan terhadap x2
x
x
x
y
1
2
1
8 



3. Tentukan
x
z


dan
y
z


dari 1
6
3
3
3



 xyz
z
y
x .
Penyelesaian:
Misalkan 1
6
)
,
,
(
3
3
3




 xyz
z
y
x
f z
y
x . Maka:
xy
yz
xy
yz
z
f
x
f
x
z
z
x
z
x
2
2
6
6
2
2
2
2
3
3













dan
xy
xz
xy
xz
z
f
y
f
y
z
z
y
z
y
2
2
6
6
2
2
2
2
3
3













4. Tentukanlah turunan parsial 




 
 y
x
z
2
2
ln terhadap x dan y
Penyelesaian:
y
x
y
x x
x
x
z
2
2
2
2
2
ln








 




dan
y
x
y
x y
y
y
z
2
2
2
2
2
ln








 




Maka diperoleh,
2
2
2
2
2
2
2










y
x
y
x
y
y
x
x
y
z
y
x
z
x
5. Jika 





 xy
x
z
2
2
sin . Carilah
x
z


Penyelesaian:
 
x
xy
xy
x x
x
x
z 2
2
2
2
sin
sin














 










x
x
x
z
xy
xy
xy
x 2
sin
cos
2
2
2
2








































xy
y
xy
x x
x
z 2
2
2
2
sin
2
cos
















xy
xy
y
x x
x
z 2
2
2
2
sin
2
cos

















xy
x
xy
x y
xy
x
z 2
3
2
2
cos
2
cos 2
6. Tentukan turunan parsial terhadap 













z
w
y
w
x
w
z
y
x ,
,
,
, dari fungsi berikut:
z
yz
xy
w z
y
x 




 2
2
2
2
2
Penyelesaian:
y
x
x
w




2
z
y
x
y
w
2
2 





1
4
2 




z
y
z
w
7. Tentukan turunan parsial dari fungsi 7
8
6
4
5
2
2
2
3





 z
z
y xz
x
z
x .
Penyelesaian:
Turunan pertama y terhadap x dan z
z
x xz
x
y
6
3
2
2
8 




x
x
y
x
8
6
2
2




z
x
z
x
y
12
8
2






Turunan kedua y terhadap x dan z
8
12
4
10
2





 xz
z
y
x
z
x
y
z
12
10
2
2




z
x
x
z
y
12
8
2






8. Tentukan turunan parsial x dan y dari fungsi berikut:
x
y
y
x
f e
xy
ln
)
,
( 

Penyelesaian:
x
y
x
y
y
x
y
x
f
ye
e
f
xy
xy
x








 1
)
,
(
x
x
x
y
y
x
f
xe
e
f
xy
xy
x
ln
ln
1
)
,
(









9. Tentukan semua turunan parsial orde 2 dari xy
y
x
w
5
2
3

 .
Penyelesaian:
y
y
x
x
w 5
2
2
3 



xy
x y
y
w
5
2
4
3




xy
x x
w
x
w
6
2
2
2














xy
x
y y
w
y
w
20
2 3
3
2
2


 













y
y
x
y
w
x
y
x
w
5
6 2
4
2

 















y
y
x
y
w
y
x
y
w
5
6 2
4
2

 















10. Ditentukan f(x,y,z) = xyz + 2 tan 





x
y
. Carilah turunan parsial pertamanya.
Penyelesaian:
yz
x
z
y
x
f


 )
,
,
(
+
2
2
1
2
x
y







 2
x
y
=
)
1
(
2
2
2
2
y
x
yx
yz


xz
y
z
y
x
f


 )
,
,
(
+
2
2
1
2
x
y







x
1
=
)
1
(
2
2
2
y
x
x
xz


xy
z
z
y
x
f


 )
,
,
(

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Kalkulus kelompok 4

  • 1. LATIHAN SOAL DAN PEMBAHASAN 1. Misalkan 𝑓(𝑥,𝑦) = 𝑥𝑦2 − sin⁡ (𝑥𝑦). Tentukanlah derivatif parsial fungsi tersebut? 2. Carilah turunan parsial terhadap x1 dan x2 dari fungsi 𝑦 = 𝑓(𝑥1,𝑥2) = 3𝑥1 2 + 𝑥1𝑥2 + 4𝑥2 2 3. Tentukan x z   dan y z   dari 𝑥3 + 𝑦3 + 𝑧3 + 6𝑥𝑦𝑧 = 1. 4. Tentukanlah turunan parsial 𝑧 = ln⁡ (𝑥2 + 𝑦2 ) terhadap x dan y! 5. Jika 𝑧 = 𝑥2 ⁡sin⁡ (𝑥𝑦2 ). Carilah x z   6. Tentukan turunan parsial terhadap               z w y w x w z y x , , , , dari fungsi berikut: 𝑤 = 𝑥2 − 𝑥𝑦 + 𝑦2 + 2𝑦𝑧 + 2𝑧2 + 𝑧 7. Tentukan turunan parsial dari fungsi 𝑦 = 𝑥3 + 5𝑧2 − 4𝑥2 𝑧 − 6𝑥𝑧2 + 8𝑧 − 7. 8. Tentukan turunan parsial x dan y dari fungsi berikut: 𝑓(𝑥, 𝑦) = 𝑒𝑥𝑦 + 𝑦 ln 𝑥 9. Tentukan semua turunan parsial orde 2 dari 𝑤 = 𝑥3 𝑦2 − 𝑥𝑦5 10. Ditentukan f(x,y,z) = xyz + 2 tan       x y . Carilah turunan parsial pertamanya.
  • 2. PENYELESAIAN: 1. Misalkan ) sin( ) , ( 2 xy y x f xy   . Tentukanlah derivatif parsial fungsi terebut! Penyelesaian: ) cos( 2 xy x xy y f     ) cos( 2 xy y x f y     xy xy y x x f x f y y x sin ) cos( 2 2 2 2                           ) cos( cos 2 ) cos( 2 xy xy xy y xy x xy x y f x                    ) cos( cos 2 ) cos( 2 xy xy xy y xy y y x f y y                          xy x xy x xy y y f y y f x sin 2 ) cos( 2 2 2 2                      Maka diperoleh,                        x f y y f x 2. Carilah turunan parsial terhadap x1 dan x2 dari fungsi 𝑦 = 𝑓(𝑥1,𝑥2) = 3𝑥1 2 + 𝑥1𝑥2 + 4𝑥2 2 Penyelesaian: Turunan terhadap x1 x x x y 2 1 1 6     Turunan terhadap x2 x x x y 1 2 1 8     3. Tentukan x z   dan y z   dari 1 6 3 3 3     xyz z y x . Penyelesaian: Misalkan 1 6 ) , , ( 3 3 3      xyz z y x f z y x . Maka:
  • 3. xy yz xy yz z f x f x z z x z x 2 2 6 6 2 2 2 2 3 3              dan xy xz xy xz z f y f y z z y z y 2 2 6 6 2 2 2 2 3 3              4. Tentukanlah turunan parsial         y x z 2 2 ln terhadap x dan y Penyelesaian: y x y x x x x z 2 2 2 2 2 ln               dan y x y x y y y z 2 2 2 2 2 ln               Maka diperoleh, 2 2 2 2 2 2 2           y x y x y y x x y z y x z x 5. Jika        xy x z 2 2 sin . Carilah x z   Penyelesaian:   x xy xy x x x x z 2 2 2 2 sin sin                           x x x z xy xy xy x 2 sin cos 2 2 2 2                                         xy y xy x x x z 2 2 2 2 sin 2 cos                 xy xy y x x x z 2 2 2 2 sin 2 cos                  xy x xy x y xy x z 2 3 2 2 cos 2 cos 2 6. Tentukan turunan parsial terhadap               z w y w x w z y x , , , , dari fungsi berikut: z yz xy w z y x       2 2 2 2 2 Penyelesaian: y x x w     2
  • 4. z y x y w 2 2       1 4 2      z y z w 7. Tentukan turunan parsial dari fungsi 7 8 6 4 5 2 2 2 3       z z y xz x z x . Penyelesaian: Turunan pertama y terhadap x dan z z x xz x y 6 3 2 2 8      x x y x 8 6 2 2     z x z x y 12 8 2       Turunan kedua y terhadap x dan z 8 12 4 10 2       xz z y x z x y z 12 10 2 2     z x x z y 12 8 2       8. Tentukan turunan parsial x dan y dari fungsi berikut: x y y x f e xy ln ) , (   Penyelesaian: x y x y y x y x f ye e f xy xy x          1 ) , ( x x x y y x f xe e f xy xy x ln ln 1 ) , (          9. Tentukan semua turunan parsial orde 2 dari xy y x w 5 2 3   . Penyelesaian:
  • 5. y y x x w 5 2 2 3     xy x y y w 5 2 4 3     xy x x w x w 6 2 2 2               xy x y y w y w 20 2 3 3 2 2                  y y x y w x y x w 5 6 2 4 2                   y y x y w y x y w 5 6 2 4 2                   10. Ditentukan f(x,y,z) = xyz + 2 tan       x y . Carilah turunan parsial pertamanya. Penyelesaian: yz x z y x f    ) , , ( + 2 2 1 2 x y         2 x y = ) 1 ( 2 2 2 2 y x yx yz   xz y z y x f    ) , , ( + 2 2 1 2 x y        x 1 = ) 1 ( 2 2 2 y x x xz   xy z z y x f    ) , , (