 append a fact
to the hash table, say <em>integrate(f) = g</em>, do this:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">(%i1) intable[f] : lambda([u],  [g(u),diff(u,%voi)]);
(%o1) lambda([u],[g(u),diff(u,%voi)])

(%i2) intfudu(f(z),z);
(%o2) g(z)

(%i3) intfudu(f(w(x)) * diff(w(x),x),x);
(%o3) g(w(x))
</pre></td></tr></table>

<p>An alternative to calling <code>intfudu</code> directly is to use the <code>extra_integration_methods</code>
mechanism; an example:
</p><table><tr><td>&nbsp;</td><td><pre