Hello! I wanted to solve this integral but really didn't understand the method show in the book.(adsbygoogle = window.adsbygoogle || []).push({});

Can anyone help me out please.

sorry I don't know how to show the integral sign, here it is

integral of - to + infinity (Cos(x)/x^2 + 2x +5 )dx

here Cos(z) = Re[exp(iz)]

I tried to reduce the denominator to a (a+b)^2 thing and then use a method that I didn't understand ( so I copied it from the book).

I need to know the stepwise solution if possible.

Thank You!

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# Contour integration problem

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