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Let f(x)={x^2|cospi/x|,\ x!=0 ,\ x=0,\ x...

Let `f(x)={x^2|cospi/x|,\ x!=0 ,\ x=0,\ x in Rdot\ t h e n\ f` is (a) Differentiable both at `x=0\ a n d\ a t\ x=2.` (b) Differentiable at `x=0\ ` but not differentiable at `x=2.` (c) Not differentiable at `x=0\ ` but differentiable at`\ x=2.` (d) Differentiable neither at `x=2\ nor\ a t\ x=2.`

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