Is f(x)=sin x differentiable at x = pi/2. If yes why?(adsbygoogle = window.adsbygoogle || []).push({});

because what i think is at pi/2 f'(x) changes from 1 to -1 so at x=pi/2 it may not be differentiable (similar to case of |x|).

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# Differentiablity of sinx at pi/2

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