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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)`

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

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

2tan(tan^(-1)(x)+tan^(-1)(x^(3))), where x 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)

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

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

tan^(-1)(cot x)-tan^(-1)(cot2x)=

tan^(-1)(cot x)+cot^(-1)(tan x)

Tan^(-1)(cotx)-Tan^(-1)(cot2x)=

tan^(-1) (cot x) +cot^(-1)(tan x) =