Question

How do you find the derivative of `cos^2x`?

Answer 1

`d/dxcos^2x=-2sinxcosx`

Explanation:

By using the power rule together with standard differentiation rules, we get

`d/dxcos^2 x=d/dx[cosx]^2`

`=2(cosx)^1 *d/dxcosx`

`=2cosx*(-sinx)`

`=-2sinxcosx`