10.7.32 Calculating integrals of a real variable using residues
condition: Calculate the integral of a function of a real variable: \[ \int_{-\infty}^{+\infty} \frac{d x}{\left(x^{2}+1\right)\left(x^{2}+4\right)\left(x^{2}+9\right)} \]
Here you can find calculations of proper and improper integrals of a real variable using residues, using various techniques.