>
                π/3
              </p>
            </td>
<td>
              <p>
                1.04719
              </p>
            </td>
<td>
            </td>
</tr>
<tr>
<td>
              <p>
                quarter_pi
              </p>
            </td>
<td>
              <p>
                π/4
              </p>
            </td>
<td>
              <p>
                0.78539816
              </p>
            </td>
<td>
              <p>
                Equivalent to POSIX constant M_PI_4
    