My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## to be a 'standard' integral also, not only the case in which ##a=1##. But I believe this getting a Calculus research trouble it is predicted of the OP to figure out how to get it done. Hints https://gabletoppak.com/gabletop-pak-leading-the-way-as-milk-carton-manufacturers-in-india/