Let f : (– 1, 1) → R be a function defined by f(x) = . If K be the set of all points at which f is not differentiable, then K has exactly

Engineering

Mathematics

Important Points on Derivability

Question

Let f : (– 1, 1) → R be a function defined by f(x) = $\max . {- | x |, - \sqrt{1 - x^{2}}}$ . If K be the set of all points at which f is not differentiable, then K has exactly

three elements

one element

five elements

two elements

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A, B, C are sharp edges