%
% latex_maths_equation.tex (normal cdf)
%
\documentclass[12pt]{article}
\usepackage{amsmath,bm}
\pagestyle{empty}
\begin{document}
\Large
\[
 \frac{1}{\sigma \sqrt{2\pi}}
   \int\limits_{-\infty}^x
   \exp -\left\{
  \frac{1}{2} \left( \frac{t-\mu}{\sigma} \right)^2 \right\}\,dt
\]
\end{document}
