My Desk of Integrals has the general case ##int frac dx x^two+a^2 ## for a 'normal' integral too, not simply the situation where by ##a=1##. But I think this currently being a Calculus research problem it is expected in the OP to determine how to do it. Hints were given https://gabletoppak.com/why-gabletop-cartons-outshine-pet-bottles-for-branding-opportunities/