{\hat{\theta }}_{0}= \, {\theta }_{0}-\frac{{\theta }_{0}{\lambda }_{0}-\rho {\theta }_{0}{\lambda }_{0}}{0-\rho },$$\end{document}$$where $\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$${\hat{\theta }}_{0}$$\end{document}$ and $\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$${\hat{\theta }}_{0}$$\end{document}$ a