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 6
 Problem Statement

In fact, I am working on an condensed matter physics paper, where I reached to an integral of this form: $$\int_{\infty}^{z} sin(2kz) \, dz$$.
offcourse, I have to solve this integral.
 Relevant Equations
 There is no relevant equations.
##\int_{\infty}^{z}sin(2kz)\,dz=\dfrac{1}{2k} \Big [cos(2kz) \Big ]_{\infty}^z=\dfrac{cos(2kz)}{2k}+\dfrac{cos(\infty)}{2k}##.
I ended up here, and I don't know how to proceed.
One recommended me to use contour integration, but I have no idea about it.
I ended up here, and I don't know how to proceed.
One recommended me to use contour integration, but I have no idea about it.