My table of Integrals has the overall circumstance ##int frac dx x^two+a^two ## as being a 'common' integral much too, not just the case exactly where ##a=1##. But I feel this staying a Calculus research problem it is expected from the OP to figure out how to get it done. https://gabletoppak.com/how-i-integrated-branding-and-design-with-an-indian-paper-bottle-manufacturer/