      </p>
            </td>
<td>
              <p>
                1/(2π)
              </p>
            </td>
<td>
              <p>
                1.59155
              </p>
            </td>
<td>
              <p>
                Widely used
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                root_pi
              </p>
            </td>
<td>
              <p>
                √π
              </p>
            </td>
<td>
              <p>
                1.77245
   