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The set of points where the function `f(x)=x|x|` is differentiable is `(-oo,\ oo)` (b) `(-oo,\ 0)uu(0,\ oo)` (c) `(0,\ oo)` (d) `[0,\ oo]`

A

`(-oo,oo)`

B

`(-oo,0) uu (0,oo)`

C

`(0,oo)`

D

`[0,oo]`

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