Question

use the chain rule to find the derivative of the following function: f(x)=cos4x

Answer 1

I know how to do the ones that have a power to them, but these ones don't know how to do.

Answer 2

Do you know the derivative of the cosine function? :)

Answer 3

-sin

Answer 4

-sin(x)

Answer 5

k cool :) so you have the chain rule. make sure you differentiate outermost function first :D

Answer 6

Chain rule is essentially, you take the derivative of the function then you take the derivative of the function in the function.
f(x) = g(h(x))
f'(x) = g'(h(x))*h'(x)

Answer 7

So what do you get fey? c: