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Macros
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How to use \newcommand in LaTeX?
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8. Defining Commands
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Commands with optional arguments - Wiki
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TUGboat, Volume 42 (2021), No. 1 41 \NewDocumentCommand versus \newcommand versus ... Joseph Wright Creating new document comman
Support OPTIONAL ARGUMENT in user defined macro by \newcommand · Issue #2228 · KaTeX/KaTeX · GitHub
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package_new_command_3.png
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