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Let f:[-1,1] to R be a function defined ...

Let `f:[-1,1] to R` be a function defined by `f(x)={x^(2)|cos((pi)/(x))| "for" x ne 0, "for "x=0`, The set of points where f is not differentiable is

A

`{x in[-1,1]:x!=0}`

B

`{x in[-1,1]:x=0 or x=2/(2n+1),n in Z}`

C

`{x in[-1,1]: x=2/(2n+1),n in Z}`

D

[-1,1]

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