2 tan ( tan^(-1)(x)+ tan^(-1)(x^(3))) " ...

`2 tan ( tan^(-1)(x)+ tan^(-1)(x^(3))) " where " x in R - {-1,1}` is equal to

A

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

B

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

C

`tan[cot^(-1)(-x)-cot^(-1)(x)] `

D

`tan(2cot^(-1)x)`

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The correct Answer is:

A, B, C

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