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\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\begin{document}
\begin{equation*}
E = MC^2 \tag{$\ast$}
\end{equation*}
\end{document}
排版後的內容是
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