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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(2 cot^(-1)x)`

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The correct Answer is:
A, B, C
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