\(\displaystyle

\[ \int \frac{\sin \left(kr-atan \left(ka \right)\right)}{kr} \frac{\sin \left(k'r-atan \left(k'a \right)\right)}{k'r} {d^3r}

\)

I haven't solved integrals that have looked like that with the d^3r term. What do you refer to this concept as (so I can know what to look for in order to study it)? And does anyone happen to have any resources where I can read up on solving them?