span class="special">/</span> <span class="special">(</span><span class="identifier">x1</span> <span class="special">-</span> <span class="identifier">x2</span><span class="special">);</span>

  <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">minus_b</span> <span class="special">*</span> <span class="identifier">minus_b</span> <span class="special">&gt;=</span> <span class="number">4</span><span class="special">*</span><span class="identifier">c</span><span c