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Use the Divergence Theorem to evaluate

Use the Divergence Theorem to evaluate \(\iint_{S} \mathbf{F} \cdot d \mathbf{S}\), where \(\mathbf{F}(x, y, z)=z^{2} x \mathbf{i}+\left(\frac{y^{3}}{3}+\cos z\right) \mathbf{j}+\left(x^{2} z+y^{2}\right) \mathbf{k}\) and \(S\) is the top half of the sphere \(x^{2}+y^{2}+z^{2}=4\). (Hint: Note that \(S\) is not a closed surface. First compute integrals over \(S_{1}\) and \(S_{2}\), where \(S_{1}\) is the disk \(x^{2}+y^{2} \leq 4\), oriented downward, and \(S_{2}=S_{1} \cup S\).)


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