$x^2 + y^2 = z^2$

Nope, this is just plaintext; never mind.

From the tutorial document:

Maths

Many users are already making good use of the Mathjax engine that is running in the forums in order to display equations. A few pointers/tricks:

1- To post an equation, simply surround TeX code with a couple of dollar signs on each side:

$$ E  = mc^2 $$

$$ E = mc^2 $$

2- If you want your equation to be displayed inline, use:

\(  e^{i\pi}+1=0 \)

\( e^{i\pi}+1=0 \)