# WP LaTeX installed for putting math into comments

WP LaTeX is installed and enabled for comments. You may read more about how to use this plugin here.

The input

$e^{\i \pi} + 1 = 0$

is rendered by the plugin as

$e^{\i \pi} + 1 = 0$

The input

$R=\frac{\displaystyle{\sum_{i=1}^n (x_i-\bar{x})(y_i- \bar{y})}}{\displaystyle{\left[ \sum_{i=1}^n(x_i-\bar{x})^2 \sum_{i=1}^n(y_i-\bar{y})^2 \right]^{1/2}}}$

turns to

$R = \frac{\displaystyle{\sum_{i=1}^n (x_i-\bar{x})(y_i- \bar{y})}}{\displaystyle{\left[ \sum_{i=1}^n(x_i-\bar{x})^2 \sum_{i=1}^n(y_i-\bar{y})^2 \right]^{1/2}}}$

Note that there should not be any line breaks in the LaTeX code you place between the $and$ tags.