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The value of int0^oo x/([(1+x)(1+x^2)])d...

The value of `int_0^oo x/([(1+x)(1+x^2)])dx` is (A) `pi/4` (B) `pi/2` (C) same as `int_0^oo dx/([(1+x)(1+x^2)]` (D) cannot be evaluated

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