Just after finding the constants A and B It is comparatively basic to compute the integral ##int frac dx x^2 + 9 ## as it could now be composed as two easier integrals. I tried but I can't see how ##A,B## are constants? The gable end roof is often a https://gabletoppak.com/from-plastic-bottles-to-gabletop-cartons-a-step-toward-solving-the-plastic-pollution-crisis/