I've been trying to get my head around solving the integral, which is the Fourier Transform representation of the Yukawa potential in k-space. Anyhow, the specifics don't matter, I am simply stuck on the last step of integration. This is the presented solution on Wikipedia:
The step, which troubles me is the following:
$\frac{1}{4\pi^2ir}\int_{-\infty}^{\infty}dk\frac{ke^{ikr}}{(k+im)(k-im)}=\frac{1}{4\pi^2ir}2i\pi\frac{im}{2im}e^{-mr}$
All the help is greatly appreciated!