My table of Integrals has the general case ##int frac dx x^two+a^two ## being a 'regular' integral much too, not only the case in which ##a=1##. But I do think this currently being a Calculus research dilemma it is expected on the OP to figure out how to get it https://gabletoppak.com/sustainable-liquid-soap-packaging-why-gabletop-cartons-are-the-eco-friendly-choice/