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$$\int_{-\infty}^{\infty} \frac{x \sin(x)}{x^2 +4} dx$$ I do not understand how to evaluate integrals by using a closed contour and passing to a limit, can someone show me using this example

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    $\begingroup$ I suggest you look at the old questions. Similar questions have been posted over and over again. $\endgroup$ – Zaid Alyafeai Mar 17 '17 at 17:02
  • $\begingroup$ It took me less than a minute to find math.stackexchange.com/questions/2172184/… $\endgroup$ – Zaid Alyafeai Mar 17 '17 at 17:03
  • $\begingroup$ i still don't understand $\endgroup$ – user424889 Mar 17 '17 at 17:43
  • $\begingroup$ What exactly you don't understand ? Write what you have tried so far. $\endgroup$ – Zaid Alyafeai Mar 17 '17 at 17:51
  • $\begingroup$ @ZaidAlyafeai good catch! why not officially making this a duplicate? $\endgroup$ – tired Mar 17 '17 at 18:28