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" 5.If "sin^(-1)(2a)/(1+a^(2))-cos^(-1)(...

" 5.If "sin^(-1)(2a)/(1+a^(2))-cos^(-1)(1-b^(2))/(1+b^(2))=tan^(-1)(2x)/(1-x^(2))" ,then prove that "x=(a-b)/(1+ab)

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sin^(-1) ""(2a)/(1+a^(2))-cos^(-1) ""(1-b^(2))/(1+b^(2))=2tan ^(-1) ""(a-b)/(1+ab)