## anonymous 5 years ago How do I find the derivative of cos^2(x)

1. anonymous

use the chain rule. that function is the composition of cos(x) and x^2

2. anonymous

thank you

3. anonymous

$y=\cos^2x$ $y'=2(cosx)^1$ $y'=2cosx$

4. anonymous

-1 fan for corec

5. anonymous

$y′=2(cosx)1(cosx)'$ $y′=2 cosx sinx$

6. anonymous

-2 (both fans for corec and the constant in front of his answer)

7. anonymous

right =) y' = -2 cosx sinx lol

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