(6) (4 marks.) Let f(u) be differential function. Compute the outward flux of the vector field F = x3i+ [if (y) + y3] j+ if (y) + 23 k across the boundary surface of the solid enclosed by the cone z = V3(x2 + y2) and two hemispheres z = V1 -x2 - 32, z = 14- 22 - 92