The ellipsoid is given by the equation \(3x^2 + y^2 + 3z^2 = 1\). The gradient \(\nabla f\) of this function \(f(x, y, z) = 3x^2 + y^2 + 3z^2\) is:
\[
\nabla f = \left( \frac{\partial f}{\partial x}, \frac{\partial f}{\partial y}, \frac{\partial f}{\partial z}
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