My table of Integrals has the overall situation ##int frac dx x^two+a^2 ## as a 'typical' integral also, not just the case in which ##a=1##. But I do think this currently being a Calculus homework problem it is anticipated of the OP to determine how to make it happen. Hints https://gabletoppak.com/choosing-between-gable-top-packaging-and-plastic-bottles-for-your-beverage-business/