Step 1:
The divergence of a vector field $\mathbf{F}=\left\langle F_{1}, F_{2}, F_{3}\right\rangle$ in Cartesian coordinates is given by the formula:
$$\nabla \cdot \mathbf{F}=\frac{\partial F_{1}}{\partial x}+\frac{\partial F_{2}}{\partial y}+\frac{\partial
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