Following Discovering the constants A and B It really is comparatively basic to compute the integral ##int frac dx x^2 + 9 ## as it could now be created as two easier integrals. I tried but I cannot see how ##A,B## are constants? The scale of the box may vary, https://gabletoppak.com/supporting-sdg-14-life-below-water-through-sustainable-edible-oil-packaging-with-gabletop-cartons/