int (0.5/n^2)/(1+n^2x^2) + (0.25/n^2)/(x+i/n)^2 + (0.25/n^2)/(x-i/n)^2 dxint (0.5/n^2)/(1+n^2x^2) + (0.25/n^2)/(x+i/n)^2 + (0.25/n^2)/(x-i/n)^2 dx

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