Construct a function which is continuous in [1,5][1,5] but not differentiable at 2,3,42, 3, 4

Construct a function which is continuous in [1,5] but not differentiable at 2,3,4.

This question is just after the definition of differentiation and the theorem that if f is finitely derivable at c, then f is also continuous at c. Please help, my textbook does not have the answer.

Answer

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Attribution
Source : Link , Question Author : Vikram , Answer Author : Did

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