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Prove that tan^(-1)x+"tan"^(-1)(2x)/(1-x...

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

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The correct Answer is:
`=tan^(-1)x+"tan"^(-1)(2x)/(1-x^(2))=LHS`
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