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\documentclass{article}
\usepackage{latexml}
\usepackage{amsmath}
\def\mockarray{\begin{array}{cc}
a & b \\
c & d \end{array}}
\def\mockcases{\begin{cases}
d & c \\
b & a \end{cases}}
\begin{document}
% standalone cases
\[\mockcases\]
% standalone array
\[\mockarray\]
% lbrace array
\[\{ \mockarray\]
% rbrace array
\[\mockarray \}\]
% matrix multiplication
\[ \mockarray \mockcases \]
% matrix in inequality
\[ a + b < \mockarray \]
% opfunction equation with piecewise matrix
\[ \arcsin \pi + \neg a = \{ \mockarray \]
\end{document}
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