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If f (x) and g (x) are two functions wit...

If f (x) and g (x) are two functions with `g(x)=x-(1)/(x)` and `fog (x)=x^(3)-(1)/(x^(3))`, then `f'(x)=`

A

`x^(2)-1/x^(2)`

B

`3x^(2)+3`

C

`3x^(2)+3/x^(4)`

D

`1+1/x^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
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