My table of Integrals has the general situation ##int frac dx x^2+a^two ## like a 'regular' integral too, not just the case in which ##a=1##. But I think this becoming a Calculus homework trouble it is expected on the OP to determine how to make it happen. Hints got over. https://gabletoppak.com/aseptic-tetra-pak-vs-non-aseptic-gable-top-choosing-the-right-carton-for-your-needs/