My desk of Integrals has the final situation ##int frac dx x^2+a^two ## as a 'typical' integral way too, not just the case where by ##a=1##. But I do think this becoming a Calculus homework difficulty it is anticipated on the OP to figure out how to do it. Hints 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/