My Table of Integrals has the final case ##int frac dx x^2+a^two ## to be a 'typical' integral as well, not only the situation where by ##a=1##. But I do think this staying a Calculus research difficulty it is expected with the OP to figure out how to get it https://gabletoppak.com/the-growing-threat-of-marine-pollution-and-how-gabletop-cartons-offer-a-solution/