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[int(0)^(oo)(x)/((1+x)(1+x^(2)))dx=],[" ...

[int_(0)^(oo)(x)/((1+x)(1+x^(2)))dx=],[" 1) "(pi)/(8)quad " 2) "(pi)/(4)quad " 3) "(pi)/(2)]quad " 4) "(pi)/(6)

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