# Jordan's Inequality

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1.) Use residues to evaluate the improper integral from 0 to infinity:

1 / (x^2 + 1)^2 dx

2.) Use Jordan's Inequality to evaluate the improper integral from -infinity to infinity:

(x^3 sin ax) / (x^4 + 4)

Thank you for your assistance.

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##### Solution Summary

Jordan's inequality is examined.

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