If `x in (0,1)` then value of `tan^(-1) ((1-x^2)/(2x)) +cos^(-1) ((1-x^2)/(1+x^2))` is (1) `pi/2` (2) `-pi/2` (3) 0 (4) `pi`

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cot {tan ^ (- 1) x + tan ^ (- 1) ((1) / (x))} + cos ^ (- 1) (1-2x ^ (2)) + cos ^ (- 1) ( 2x ^ (2) -1) = pi, x> 0