My desk of Integrals has the final situation ##int frac dx x^2+a^two ## to be a 'regular' integral far too, not only the case where by ##a=one##. But I think this getting a Calculus research problem it is predicted of your OP to figure out how to get it done. https://gabletoppak.com/how-gable-top-pak-and-paper-bottles-lead-in-sustainable-beverage-packaging/