Why is the derivative of cos^2(x) = -2cos(x)sin(x)

[regal phoenix]

I know your suppose to use the chain and power rules but am getting -2sin(x)? Does this have to do with the power of 2 being on cos instead of cos(x)^2

[vast iris]

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[vagrant leaf]

Apply chain rule

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

[sonic sleet]

Omega

[vagrant leaf]

it's just the notation for positive powers of trig functions

[upbeat jolt]

@regal phoenix

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[regal phoenix]

+close

[upbeat jolt]

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