Question

f(x)=cos⁴x,find f'(x) for it.

Answer 1

Answer:

-4 cos³x sinx

Step-by-step explanation:

differentiating cos⁴x as differentiationg x^n

we will get nx^x-1 so..

4 cos³x ---eq I

but instead of 'x' we're having "cos x"

so we have to differentiate it and multiply it to the eq I

dy/dx of cos x is.. -sinx

so the result is..

-4 cos³x sinx