Let f : R $ \to $ R be a function defined by f(x) = max {x, x2}. Let S denote the set of all points in R, where f is not differentiable. Then :

Question

Let f : R $ \to $ R be a function defined by
f(x) = max {x, x²}. Let S denote the set of all points in R, where f is not differentiable. Then :

{0, 1}

{0}

$\phi $(an empty set)

{1}

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