My table of Integrals has the general case ##int frac dx x^two+a^two ## to be a 'standard' integral too, not just the situation where by ##a=one##. But I feel this currently being a Calculus homework problem it is anticipated of the OP to figure out how to do it. Hints https://gabletoppak.com/how-i-integrated-branding-and-design-with-an-indian-paper-bottle-manufacturer/