Prove that : `tan1/2{sin^(-1)(2x)/(1+x^2)+cos^(-1)(1-y^2)/(1+y^2)}=(x+ – InterviewSolution

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1.	Prove that : `tan1/2{sin^(-1)(2x)/(1+x^2)+cos^(-1)(1-y^2)/(1+y^2)}=(x+y)/(1-x y)`, if `\|x\|0`and `x y
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