My table of Integrals has the general circumstance ##int frac dx x^two+a^2 ## like a 'normal' integral also, not only the case where by ##a=one##. But I feel this getting a Calculus homework problem it is predicted from the OP to figure out how to do it. Hints got over. https://gabletoppak.com/lakes-developed-under-smart-cities-initiative-in-coimbatore-turn-dumping-grounds-for-plastic-waste/