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\documentclass{article} \usepackage{amsmath} \usepackage{amssymb} \usepackage{amsfonts} \thispagestyle{empty} \begin{document} \begin{equation} \rho(R)=\frac{\rho_0}{\frac{R}{R_s}(1+\frac{R}{R_s})^2}\notag \end{equation} \end{document}