Macros

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<param name=macros value="\define{\basis}[1]{e_{#1}}">

<param name=eq value="x=\basis{y + z}">

<param name=macros value="
   \define{\at}{\tilde{\alpha}}
   \define{\disc}[3]{\sqrt{#2^2 - 4 #1 #3}}">

<param name=eq value="\at = \frac{-b \pm \disc{a}{b}{c}}{2a}">

More information on macros may be found in WebTeX Macros of the WebTeX documentation.