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Prove that : 1/6tan^(-1)""(2x)/(1-x^2)+...

Prove that : `1/6tan^(-1)""(2x)/(1-x^2)+1/9tan^(-1)""(3x-x^2)/(1-3x^2)+1/12 tan^(-1)""(4x-4x^3)/((1-6x^2+x^4))=` `tan^(-1)x`

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