My table of Integrals has the general scenario ##int frac dx x^two+a^2 ## being a 'conventional' integral way too, not only the situation in which ##a=1##. But I feel this being a Calculus research trouble it is expected from the OP to determine how to make it happen. Hints were https://gabletoppak.com/aseptic-tetra-pak-vs-non-aseptic-gable-top-choosing-the-right-carton-for-your-needs/