Consider the following. the volume of the solid that lies within both the cylinder x2 + y2 = 16 and the sphere x2 + y2 + z2 = 81 Using cylindrical coordinates, write an integral that can be evaluated to find the volume V of the given solid. (Choose 0 < A ≤ 2π. Choose 0 < B.) V = ∫0 A ∫0 B ∫ −81 − r2 81 − r2 ( )dz dr dθ A = B = Find the volume.