\documentclass[12pt]{article}
\usepackage{amssymb,amsmath,amscd,concmath,amsfonts}
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\begin{document}
\begin{equation*}
  T(\omega) = T_m \left(1 - \beta \biggl(\frac{\omega}{\omega_m} - 1\biggr)^2
  \right),
  \label{eq:cruise:torque}
\end{equation*}
\end{document}