My table of Integrals has the final case ##int frac dx x^2+a^two ## like a 'standard' integral way too, not only the situation where ##a=1##. But I think this getting a Calculus homework dilemma it is predicted with the OP to determine how to make it happen. Hints got above. https://gabletoppak.com/how-i-integrated-branding-and-design-with-an-indian-paper-bottle-manufacturer/