My desk of Integrals has the general circumstance ##int frac dx x^two+a^two ## for a 'regular' integral far too, not only the situation where by ##a=one##. But I think this currently being a Calculus homework trouble it is predicted from the OP to figure out how to get it done. https://gabletoppak.com/reducing-microplastics-why-gable-top-cartons-are-better-than-plastic-water-bottles/