Math

Evaluating $\int_{-1}^{\infty}\frac{dx}{x^4-x^3-3x^2-x+3}$ using residues

Step-by-step mathematics solution: Evaluating $\int_{-1}^{\infty}\frac{dx}{x^4-x^3-3x^2-x+3}$ using residues

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Original question: Evaluating $\int_{-1}^{\infty}\frac{dx}{x^4-x^3-3x^2-x+3}$ using residues on Mathematics Stack Exchange, licensed CC BY-SA.

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