pls help me about this question.

A surface S is described by z = 2 ? (x 2 + y 2 ) 2 + 5 ? p x 2 + y 2 1 2 for x 2 + y 2 ? 1. Compute the following (upward flux): Z Z S F dS, where F = hsin(z)x ? xy, ? sin(z)y + ln(x)x z y, yz ? x z i. [20] Hint: Find a field G (called a vector potential) so that ? G = F and use Stokes' Theorem: Z Z S ? G dS = Z ?S G dr

NIH 3. A surface S is described by z = 2 - (x2 + y?) + 5- Vx2+2 for x2 + y?