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2"tan"(tan^(-1)(x)+tan^(-1)(x^3)),w h e ...

`2"tan"(tan^(-1)(x)+tan^(-1)(x^3)),w h e r ex 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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