Use the surface integral in Stokes' Theorem to calculate the flux of the curl of the field F = x^2yi + 4y^3zj + zk across the surface S: (r) = r cos thetai + r sin thetaj + k, 0 ≤ r ≤ 3, 0 ≤ theta ≤ 2pi in the direction with
不
a positive k-component for n.