My table of Integrals has the overall scenario ##int frac dx x^two+a^2 ## as a 'regular' integral as well, not just the situation where ##a=1##. But I think this staying a Calculus homework difficulty it is predicted with the OP to figure out how to get it done. Hints got https://gabletoppak.com/gabletop-pak-the-ideal-packaging-solution-for-dairy-products/