Following Obtaining the constants A and B It can be relatively easy to compute the integral ##int frac dx x^2 + 9 ## as it could now be composed as two less difficult integrals. I attempted but I can not see how ##A,B## are constants? The exponential dies off more https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/