My desk of Integrals has the overall situation ##int frac dx x^2+a^two ## for a 'typical' integral way too, not simply the case where ##a=one##. But I think this remaining a Calculus research challenge it is expected with the OP to figure out how to make it happen. Hints got https://gabletoppak.com/sustainability-in-action-gable-top-cartons-to-save-our-oceans/