My table of Integrals has the general circumstance ##int frac dx x^2+a^2 ## being a 'regular' integral also, not simply the case where ##a=one##. But I feel this remaining a Calculus homework trouble it is expected with the OP to figure out how to get it done. Hints were given https://gabletoppak.com/india-leads-in-generating-plastic-waste-with-10-2-mn-tonnes-a-year-study/