Evaluate the following integral, ffzdS, where S is the part of the sphere x2 + y2 + z2 = 81 that lies above the cone z = Ag■,/x2 + y2 .

Problem #3: Evaluate the following integral, ffzdS, where S is the part of the sphere x2 + y2 + z2 = 81 that lies above the cone z = Ag■,/x2 + y2 .
Problem #3:
Enter your answer symbolically, as in these examples