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Let f'(x)=3x^2sin1/x-xcos1/x , if x!=0\ ...

Let `f'(x)=3x^2sin1/x-xcos1/x ,` if `x!=0\ ;` `f(0)=0` and `f(1//pi)=0` then: `f(x)` is continuous at `x=0` `f(x)` is non derivable at `x=0` `f'(x)` is continuous at `x=0` `f'(x)` is non derivable at `x=0`

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