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20.10
e
(x−x4)−2−2(x−x4)−3⋅1−4x3−2(x−x4)−3
Behalve de kettingregel gebruik je ook de somregel!
20.11
a
((2x−3)5)′→5(2x−3)4⋅2→10(2x−3)4
b
((x2+5)−1)′→−1(x2+5)−2⋅2x→−2x(x2+5)−2
c
((√3x−4))′→12(3x−4)−12⋅3→32(3x−4)−12
d
((√x2+x))′→12(x2+x)−12⋅(2x+1)→12(2x+1)(x2+x)−12
e
((x+4x3)−3)′→−3(x+4x3)−4⋅(1+12x2)→−3(1+12x2)(x+4x3)−4
20.12
a
(√1+x+x2)′→12(1+x+x2)−12⋅(1+2x)→12(1+2x)(1+x+x2)−12
b
(3√1+x+x2)′→13(1+x+x2)−23⋅(1+2x)→13(1+2x)(1+x+x2)−23
c
((x2−1)4)′→4(x2−1)3⋅2x→8x(x2−1)3
d
(√x3+1)′→12(x3+1)−12⋅3x2→32x2(x3+1)−12
e
((x2+x)32)′→32(x2+x)12⋅(2x+1)→32(2x+1)(x2+x)−12
20.13
b
xcos(2x)cos(2x)+x−sin(2x)⋅2cos(2x)−2xsin(2x)
Behalve de productregel gebruik je hierbij ook de kettingregel!
20.14
a
√x+1⋅lnx→(x+1)12⋅lnx+√x+11x→12⋅(x+1)−12⋅lnx+√x+1⋅1x→12⋅1(x+1)12⋅lnx+√x+1x→12(x+1)12⋅lnx1+√x+1x→lnx2√(x+1)+√x+1x
c
xln3√x→1x0⋅ln3√x+x⋅13√x→1⋅ln3√x+x⋅1x13→ln3√x+x⋅x−13→ln3√x+x1⋅x−13→ln3√x+x1⋅x−13
Deze is nog niet correct, antwoord moet zijn:
ln3√x+13