 <p>
                one_div_root_two
              </p>
            </td>
<td>
              <p>
                1/√2
              </p>
            </td>
<td>
              <p>
                0.707106
              </p>
            </td>
<td>
              <p>
                Equivalent to POSIX constant M_SQRT1_2
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <span class="bold"><strong>π and related</strong></span>
              </p>
            </td>
<td>
    