My table of Integrals has the general case ##int frac dx x^two+a^two ## being a 'common' integral way too, not only the case exactly where ##a=one##. But I think this becoming a Calculus homework dilemma it is predicted of your OP to figure out how to do it. Hints were https://gabletoppak.com/sustainable-liquid-soap-packaging-why-gabletop-cartons-are-the-eco-friendly-choice/