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

If `sin^-1 (2a/(1+a^2)) + cos^-1 ((1-a^2)/(1+a^2)) = tan^-1 ((2x)/(1-x^2))`, where a, x `in` (0,1)`, then the value of x is

A

0

B

`a/2`

C

a

D

`2a/(1-a^2)`

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