Right after discovering the constants A and B it's comparatively easy to compute the integral ##int frac dx x^2 + 9 ## as it might now be penned as two easier integrals. I tried but I cannot see how ##A,B## are constants? Most cartons had a capacity of 200 mL. https://gabletoppak.com/why-gabletop-cartons-outshine-pet-bottles-for-branding-opportunities/