Differentiable function proofs, true or false? – math.stackexchange.com

Differentiable function proofs, true or false? – math.stackexchange.com

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Question: " if $(f \circ f)$ is differentiable on $\mathbb R$, then $f$ is differentiable on $\mathbb R$ ". Is this statement true or false and why? I have had a look at this question and really ...

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