If x1=2tan^(-1)((1+x)/(1-x)),x2=sin^(-1)...

If `x_1=2tan^(-1)((1+x)/(1-x)),x_2=sin^(-1)((1-x^2)/(1+x^2))` , where `x in (0,1),` then `x_1+x_2` is equal to 0 (b) `2pi` (c) `pi` (d) none of these

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