My desk of Integrals has the overall case ##int frac dx x^two+a^2 ## as being a 'standard' integral too, not only the case where by ##a=1##. But I believe this getting a Calculus research issue it is predicted of your OP to determine how to get it done. Hints got https://gabletoppak.com/how-gable-top-pak-and-paper-bottles-lead-in-sustainable-beverage-packaging/