Word Count : 174

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Consider the integral [ I = \int_0^{\infty} \frac{dx}{x^2 + 1}. ] We extend it to the entire real axis: [ \int_{-\infty}^{\infty} \frac{dx}{x^2 + 1} = 2 \int_0^{\infty} \frac{dx}{x^2 + ___ ___ _______ ____ ________ __________ _______ ______ ________ _________ _____.
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