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

If `sin^(-1) ((2a)/(1+a^2))+ sin^(-1) ((2b)/(1+b^2)) = 2 tan^(-1)x` then `x=`

A

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

B

`(b)/(1+ab)`

C

`(b)/(1-ab)`

D

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

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The correct Answer is:
D
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