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if sin^-1(2a/1+a^2) + cos^-1(1-b^2)/(1+b...

if` sin^-1(2a/1+a^2) + cos^-1(1-b^2)/(1+b^2) = tan^-1(2a/1-x^2) the prove that x =(a-b)/(1+ab)`

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