Mathematical equations in form of LaTeX or MathML code can be rendered with the support of MathJax. MathML works out of the box. If you’re using LaTeX you need to wrap your equation with $$ as shown in the following example:
$$ z = r \cdot (\sin{\phi} + \cos{\phi} \cdot i) $$
$$ z = r \cdot (\sin{\phi} + \cos{\phi} \cdot i) $$
You can also print formulas inline: $a^2 + b^2 = c^2$. In this case wrap the formula only once with $.