Question

What is the derivative of `f(x)=xcos(cosx))`?

Answer 1

`f'(x)=cos(cosx)+xsin(cosx)sinx`

Explanation:

`f(x)=xcos(cosx)`

`f'(x)=(xcos(cosx))'=cos(cosx)-xsin(cosx)(cosx)'=cos(cosx)+xsin(cosx)sinx`