Latex support is based on MathJax.
Enclose the LaTex formula in $$...$$. Some examples:
| \(y^{x}\) | y^{x} |
\(y_{x}\) | y_{x} |
| \(\frac{x}{y}\) | \frac{x}{y} |
\(\sum_{k=1}^n\) | \sum_{k=1}^n |
| \(\sqrt[n]{x}\) | \sqrt[n]{x} |
\(\prod_{k=1}^n\) | \prod_{k=1}^n |
See more examples at here