Needed to write an equation (or eight) so just refreshed my knowledge of LaTeX and KaTeX

Which equations I am writing from these:

$$ \oint_S \overrightarrow{E} \cdot \hat{n} da = \frac{q_{enc}}{\epsilon _0} $$

and

$$ \nabla \cdot \overrightarrow{E} = \frac{\rho}{\epsilon _0} $$

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