After discovering the constants A and B It can be reasonably basic to compute the integral ##int frac dx x^2 + 9 ## as it may now be prepared as two more simple integrals. I tried but I are unable to see how ##A,B## are constants? There seems to be https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/