My table of Integrals has the overall situation ##int frac dx x^two+a^2 ## to be a 'regular' integral far too, not only the situation where by ##a=1##. But I think this currently being a Calculus research dilemma it is anticipated on the OP to figure out how to get it https://gabletoppak.com/how-gable-top-pak-and-paper-bottles-lead-in-sustainable-beverage-packaging/