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The value of int- 2^1(tan^(- 1)(x/(x^2+1...

The value of `int_- 2^1(tan^(- 1)(x/(x^2+1))+tan^(- 1)((x^2+1)/x))dx` is (i)`pi/2` (ii)`-pi/2` (iii)`pi` (iv)`-pi`

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