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\documentclass{article}
\usepackage{amsmath} % pkg required by EasyLatex
\usepackage{amsfonts} % pkg required by EasyLatex
\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex
\begin{document}
\begin{align}
(A - \lambda I), \textrm{where I = }
\\ \left[ \begin{array}{lll}
1 & 0 & 0
\\ 0 & 1 & 0
\\ 0 & 0 & 1
\end{array} \right]
\end{align}
\end{document}
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