\documentclass[12pt]{article}
\thispagestyle{empty}
\usepackage{amsmath}
\begin{document}
\huge{
$\sin(x) \cos(x) = \frac{1}{2i}\left(\exp(i x)-\exp(-i x) \right) \frac{1}{2}\left(\exp(i x)+\exp(-i x) \right)$
}
\end{document}
