Question

Find the derivative of the function (Use the chain rule).

Answer 1

Would you be as kind as to provide the function in question?

Answer 2

Sorry, internet screwed up as I was writing the function.

\[y=\cos^2(2x)\]

Answer 3

My attempt:
f'(x)=2(cos(2x))
f'(x)=2(cos(2x))(-sin(2x)(2)

Answer 4

You're correct man!

Answer 5

Oh thats a relief, thanks! I guess I wrote the wrong answer in my notes.

Answer 6

Is your solution in the book in this form f'(x)=-2sin(4x) ?

Answer 7

I dont think so, I was just reviewing the examples we did in Calc today.

Answer 8

Then you're correct. Go with that!