10.7.32 Calculating Integrals of a Real Variable Usidues

Condition: Calculate the integral from the function of the actual variable: \ [\ int _ {-\ infty}^{+\ infty} \ frac {d x} {\ left (x^{2} +1 \ right) \ left (x^{2} +4 \ right) \ left (x^{2} +9 \ right)} \]]