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The Jacobian Elliptic functions are defined in Abramowitz & Stegun,
Chapter 16. The functions are declared in the header file
`gsl_sf_elljac.h'.
- Function: int gsl_sf_elljac_e (double u, double m, double * sn, double * cn, double * dn)
-
This function computes the Jacobian elliptic functions @math{sn(u|m)},
@math{cn(u|m)}, @math{dn(u|m)} by descending Landen
transformations.
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