My table of Integrals has the general scenario ##int frac dx x^two+a^2 ## like a 'conventional' integral as well, not simply the situation where ##a=1##. But I feel this remaining a Calculus homework difficulty it is predicted of your 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/