My table of Integrals has the general situation ##int frac dx x^2+a^2 ## like a 'typical' integral much too, not just the situation where ##a=1##. But I think this becoming a Calculus homework difficulty it is anticipated on the OP to determine how to get it done. Hints were given https://gabletoppak.com/how-gable-top-pak-can-enhance-your-brand-and-customer-experience/