My Table of Integrals has the general situation ##int frac dx x^2+a^2 ## like a 'common' integral far too, not merely the situation where ##a=one##. But I believe this becoming a Calculus homework problem it is expected from the OP to determine how to make it happen. Hints got above. https://gabletoppak.com/how-gable-top-pak-can-enhance-your-brand-and-customer-experience/