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

જો `sin^-1((2a)/(1+a^2))+sin^-1((2b)/(1+b^2))=2tan^-1 x` તો x=______

A

`(a-b)/(1+ab)`

B

`(a+b)/(1-ab)`

C

`b/(1-ab)`

D

`b/(1+ab)`

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