iv></div>
<p>
          There are twelve Jacobi Elliptic functions, of which the three copolar
          functions <span class="emphasis"><em>sn</em></span>, <span class="emphasis"><em>cn</em></span> and <span class="emphasis"><em>dn</em></span>
          are the most important as the other nine can be computed from these three
          <a href="#ftn.math_toolkit.special.jacobi.jac_over.f0" class="footnote"><sup class="footnote"><a name="math_toolkit.special.jacobi.jac_over.f0"></a>[2]</sup></a> <a href="#