My table of Integrals has the general case ##int frac dx x^2+a^two ## to be a 'standard' integral also, not only the case the place ##a=1##. But I feel this currently being a Calculus research challenge it is expected of your OP to determine how to do it. Hints got https://gabletoppak.com/reducing-microplastics-why-gable-top-cartons-are-better-than-plastic-water-bottles/