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Let f : R to R be a function defined by...

Let `f : R to R ` be a function defined by `f(x) = max. {x, x^(3)}`. The set of all points where `f(x) ` is NOT differenctiable is
(a) `{-1, 1}`
(b) `{-1, 0}`
(c ) `{0, 1}`
(d) ` {-1, 0, 1}`

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