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Derivative of sin²x

EasyCalculus~2m

Let f(x)=sin⁡2xf(x)=\sin^2 x. What is f′ ⁣(π4)f'\!\left(\tfrac{\pi}{4}\right)?

Show hints (2)+
  1. $\tfrac{d}{dx}\sin^2x=2\sin x\cos x$.
  2. That equals $\sin 2x$.

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