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The set of points where the function f(x...

The set of points where the function `f(x) = x |x|` is differentiable is

A

`(-oo,oo)`

B

`(-oo , 0) cup ( 0,oo) `

C

`(o ,oo)`

D

`[0, oo) `

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The correct Answer is:
A
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