                                &quot;  &quot;&quot;&quot;&quot;   &quot;
                                  &quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;
(%i6) rembox (expr2, BAR);
                   FOO&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;
                   &quot;    &quot;&quot;&quot;&quot;&quot;&quot;&quot; &quot;   a d - b c
(%o6)              &quot;sin(&quot;%pi x&quot;)&quot; + ---------
                   &quot;    &quot;&quot;&quot;&quot;&quot;&quot