1.

Prove that tan^(-1)x+"tan"^(-1)(2x)/(1-x^(2))=tan^(-1)((3x-x^(3))/(1-3x^(2))),|x|lt1/(sqrt(3))

Answer»

`(3x-x^(3))/(1-3x^(2))`
`(3x+x^(3))/(1-3x^(2))`
`(3x-x^(3))/(1+3x^(2))`
`(3x+x^(3))/(1+3x^(2))`

ANSWER :A


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