My desk of Integrals has the general case ##int frac dx x^two+a^two ## as a 'common' integral too, not merely the situation exactly where ##a=1##. But I think this remaining a Calculus homework difficulty it is predicted from the OP to figure out how to do it. Hints were given https://gabletoppak.com/glass-bottles-for-beer-soda-and-even-water-found-to-contain-toxic-levels-of-cancer-linked-microplastics-than-plastic-bottles-study-says/