My table of Integrals has the overall case ##int frac dx x^two+a^2 ## as being a 'normal' integral much too, not only the case wherever ##a=1##. But I think this remaining a Calculus homework problem it is expected on the OP to determine how to do it. Hints got over. https://gabletoppak.com/india-leads-in-generating-plastic-waste-with-10-2-mn-tonnes-a-year-study/