\documentclass{article}

\documentclass{article}
\usepackage{amsmath} % pkg required by EasyLatex
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\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex

\begin{document}

$\frac{3.6}{2^2}$

\end{document}