- #1

bryansonex

- 3

- 0

## Homework Statement

Differentiate the following

[tex]cos^2 x[/tex]

## The Attempt at a Solution

[tex]

\frac{d(cos^2 x)}{dx}

= 2 (-sin^{2-1} x).\frac{dx}{dx}

= 2 (-sin x).1

= -2 sin x

[/tex]

But the answer given is-

[tex]

-2 cos x sin x

[/tex]

Can you please tell me what's wrong !