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config/libreoffice/4/user/TexMaths/tmp/tmpfile.tex

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+\documentclass[10pt,dvips]{article}
+\usepackage{amsmath}
+\usepackage{amssymb}
+\usepackage[usenames]{color}
+\usepackage{ifxetex}
+\usepackage{ifluatex}
+
+% XeLaTeX compiler
+\ifxetex
+
+    \usepackage{fontspec}
+    \usepackage{unicode-math}
+
+    % Uncomment these lines for alternative fonts
+    %\setmainfont{FreeSerif}
+    %\setmathfont{FreeSerif}
+
+% LuaLaTeX compiler
+\else\ifluatex
+
+    \usepackage{fontspec}
+    \usepackage{lualatex-math}
+
+% LaTeX compiler
+\else
+
+    % Uncomment this line for sans-serif maths font
+    %\everymath{\mathsf{\xdef\mysf{\mathgroup\the\mathgroup\relax}}\mysf}
+
+\fi\fi
+
+% Uncomment this line for custom color
+%\definecolor{mycolor}{RGB}{0, 130, 180}
+
+
+
+\pagestyle{empty}
+\begin{document}
+\varepsilon = \frac{RMS-RMS_{mean}}{RMS_{mean}}\times 100
+\end{document}