First, we need to find the divergence of F. The divergence of a vector field F = (P, Q, R) is given by:
$$
\nabla \cdot F = \frac{\partial P}{\partial x} + \frac{\partial Q}{\partial y} + \frac{\partial R}{\partial z}
$$
In our case, F = (9z^2, y, 3x^2z),
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