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<title>Example of defining a macro that autoloads an extension</title>
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<!--
 |
 |  This page shows how to define macros that autoloads an extension
 |  where those macros are implemented.
 |  
 |  The \cancel, \bcancel, \xcancel, and \cancelto macros are
 |  all defined within the cancel extension, so we tie these
 |  macros to the function that loads an extension, passing it
 |  the name of the extension to load.
 |
 |-->

<script type="text/x-mathjax-config">
MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
  MathJax.Hub.Insert(MathJax.InputJax.TeX.Definitions.macros,{
    cancel: ["Extension","cancel"],
    bcancel: ["Extension","cancel"],
    xcancel: ["Extension","cancel"],
    cancelto: ["Extension","cancel"]
  });
});
</script>
<script type="text/javascript" src="../MathJax.js?config=TeX-AMS_HTML-full"></script>

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<p>
This page makes <code>\cancel</code>, <code>\bcancel</code>, 
<code>\xcancel</code>, and <code>\cancelto</code> all be defined so that 
they will load the <code>cancel.js</code> extension when first used.
</p>

<p>
Here is the first usage:  \(\cancel{x+1}\).  It will cause the cancel 
package to be loaded automatically.
</p>

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