If f(x)={x^3,x^2<1 and x,x^2>=1 then f(x...

If `f(x)={x^3,x^2<1 and x,x^2>=1` then `f(x)` is differentiable at

A

`(-oo,oo)-{1}`

B

`(-oo,oo)-{1-1}`

C

`(-oo,oo)-{1-1,0}`

D

`(-oo,oo)-{-1}`

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The correct Answer is:

B

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