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" 7Prove that "tan^(-1)x+tan^(-1)(2x)/(1...

" 7Prove that "tan^(-1)x+tan^(-1)(2x)/(1-x^(2))=tan^(-1)((3x-x^(3))/(1-3x^(2))),|x|<(1)/(sqrt(3))

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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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tan^(-1)x+tan^(-1)(2x)/(1-x^(2))=pi+tan^(-1)(3x-x^(3))/(1-3x^(2)),(x>0)