- #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 !