Hyperbolic Trigonometric Functions

Function: double gsl_sf_lnsinh (double x)

Function: int gsl_sf_lnsinh_e (double x, gsl_sf_result * result)

These routines compute @math{\log(\sinh(x))} for @math{x > 0}.

Function: double gsl_sf_lncosh (double x)

Function: int gsl_sf_lncosh_e (double x, gsl_sf_result * result)

These routines compute @math{\log(\cosh(x))} for any x.