Evaluate the surface integral by applying Stokes' theorem to the integral / V X F . n dS , when 2 () + # + x). (2 - 1) 2 F(x, y, Z) = +y + x) . z, 6 . ery . cos(z) 3 x and S is the surface x2 + y2 + z? = 4, z > 0, with upper side as the positive side. The result of the integral is