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###### Use residues to find the integrals in Exercises.$$ext { P.V. } int_{-infty}^{-} frac{x^{3} sin 2 x d x}{x^{4}+4}$$

Use residues to find the integrals in Exercises. $$ ext { P.V. } int_{-infty}^{-} frac{x^{3} sin 2 x d x}{x^{4}+4} $$

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