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Let f : R rarr R be a function defined b...

Let `f : R rarr R` be a function defined by `f(x) = max {x,x^(3)}`. The set of all points where f(x) is not differentiable is

A

{-1,1}

B

{-1,0}

C

{0,1}

D

{-1,0,1}

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The correct Answer is:
D
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