My Table of Integrals has the overall case ##int frac dx x^two+a^2 ## to be a 'common' integral too, not just the case in which ##a=1##. But I feel this remaining a Calculus homework problem it is anticipated of your OP to determine how to make it happen. Hints got https://gabletoppak.com/the-benefits-of-switching-to-sustainable-milk-cartons-today/