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Calculate integral from 0 to ∞ dx/ ((1 + x2) ^2) (by integrating the function 1...

Calculate integral from 0 to ∞ dx/ ((1 + x2) ^2) (by integrating the function 1 (1 + z 2) 2 around the upper half-circle of radius R, centered at 0, and letting R → ∞.)

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