\begin{now}
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\documentclass{article} \usepackage{amsmath} \title{Cases} \author{VK} \date{\today} \begin{document} \maketitle $$ 1+(-1)^n=\begin{cases} 0, & \text{if $n$ odd}\\ 2, & \text{otherwise} \end{cases} $$ \end{document}
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