Continuity and DifferentiabilityMedium

Question

The set of all point where the function f(x) = 2x |x| is differentiable is -

Options

A.(-∞, ∞)
B.(-∞, 0) υ (0, )
C.(0, ∞)
D.[0, ∞)

Solution

[0, ∞)

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