If (f ∘ f) is differentiable, is f also differentiable? – math.stackexchange.com

If (f ∘ f) is differentiable, is f also differentiable? – 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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