re class="example">(%i1) box (a^2 + b^2);
                            &quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;
                            &quot; 2    2&quot;
(%o1)                       &quot;b  + a &quot;
                            &quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;
(%i2) a : 1234;
(%o2)                         1234
(%i3) b : c - d;
(%o3)                         c - d
(%i4) box (a^2 + b^2);
                      &quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot