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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 `(2x)/(1-x^2)` `t(2tan^(-1)x)` `tan(cot^(-1)(-x)-cot^(-1)(x))` `"tan"(2cot^(-1)x)`

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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A, B, C
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