My Table of Integrals has the overall circumstance ##int frac dx x^two+a^2 ## being a 'regular' integral much too, not simply the situation exactly where ##a=1##. But I believe this currently being a Calculus research problem it is expected with the OP to figure out how to make it happen. https://gabletoppak.com/how-gable-top-pak-and-paper-bottles-lead-in-sustainable-beverage-packaging/