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Unfortunately, a couple things on this tutorial don't apply on the Azimuth Forum! Most importantly:
For "displayed" equations, centered on the page, use double dollar signs: $$E = \sqrt{m^2 + p^2}$$.
For "inline" equations, mixed in with your text, use this method: \\(E = \sqrt{m^2 + p^2}\\).
You may need to hit "refresh" on your browser to see the LaTeX symbols rendered as math.