I wanna calculate the integral $$\int_0^\infty \mathrm d q \frac{1}{\cos ka -\cos qa}.$$ I think this problem can be solved by using the contour integration, but I don't really have a good idea on how to manipulate the integrand. Any comment would be appreciated!
2026-04-23 11:10:35.1776942635
Contour integration for inverse cosine
53 Views Asked by Bumbble Comm https://math.techqa.club/user/bumbble-comm/detail AtRelated Questions in CONTOUR-INTEGRATION
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