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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

`3x^(2)+3`

B

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

C

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

D

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

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A
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