                      &quot;h &quot;
                                     &quot;&quot;&quot;&quot;
(%i3) expr2: lpart (BAR, lpart (FOO, %, 1), 2);
                  FOO&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;   BAR&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;
                  &quot;    &quot;&quot;&quot;&quot;&quot;&quot;&quot; &quot;   &quot;a d - b c&quot;
(%o3)             &quot;sin(&quot;%pi x&quot;)&quot; + &quot;---------&quot;
                  &quot;    &quot;&quot;&quo