If 0ltxlt1, then tan^-1 (sqrt(1-x^2)/(1+...

If `0ltxlt1, then tan^-1 (sqrt(1-x^2)/(1+x)` is equal to (A) `1/2cos^-1 x` (B) `cos^-1 (sqrt(1+x)/2)` (C) `cos^-1 (sqrt(1+x0/4)` (D) `1/2 tan^-1 (sqrt(1+x)/(1-x))`

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