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### Jacobi Elliptic Function cn

##### Synopsis

    #include <boost/math/special_functions/jacobi_elliptic.hpp>

    namespace boost { namespace math {

     template <class T, class U>
     calculated-result-type jacobi_cn(T k, U u);

     template <class T, class U, class Policy>
     calculated-result-type jacobi_cn(T k, U u, const Policy& pol);

    }} // namespaces

##### Description

This function returns the Jacobi elliptic function cn.

The final Policy argument is optional and can be used to control the behaviour of the function: how it handles errors, what level of precision to use etc. Refer to the policy documentation for more details.

This function is a trivial wrapper around jacobi_elliptic.