My table of Integrals has the general circumstance ##int frac dx x^two+a^2 ## to be a 'normal' integral also, not simply the case in which ##a=1##. But I believe this being a Calculus homework dilemma it is expected of the OP to determine how to do it. Hints got over. https://gabletoppak.com/why-gabletop-cartons-outshine-pet-bottles-for-branding-opportunities/