dividual functions are all really thin wrappers
        around the function <a class="link" href="jacobi_elliptic.html" title="Jacobi Elliptic SN, CN and DN">jacobi_elliptic</a>
        which calculates 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> in a single function call. Thus if you need more
        than one of these functions for a given set of arguments, it's most efficient
       