lim_(a->∞) integral_0^a 1/(1 + x^2) dx + lim_(b->-∞) integral_b^0 1/(1 + x^2) dxlim_(a->∞) integral_0^a 1/(1 + x^2) dx + lim_(b->-∞) integral_b^0 1/(1 + x^2) dx

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