Find the value of tan { 1/2 sin^(-1) ...

Find the value of
`tan { 1/2 sin^(-1) ((2x)/(1+x^(2))) + 1/2 cos^(-1) ((1-y^(2))/(1+ y^(2)))}`

Verified by Experts

The correct Answer is:

` = (x+y)/(1 - xy) `

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