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If |x| le 1, then 2 tan^-1 x + sin^-1 ((...

If `|x| le 1`, then `2 tan^-1 x + sin^-1 ((2x)/(1+x^2))` is equal to

A

0

B

`pi/2`

C

`pi`

D

`4 tan^-1 x`.

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