__Function:__double**gsl_sf_Shi***(double*`x`)__Function:__int**gsl_sf_Shi_e***(double*`x`, gsl_sf_result *`result`)- These routines compute the integral @math{Shi(x) = \int_0^x dt \sinh(t)/t}.

__Function:__double**gsl_sf_Chi***(double*`x`)__Function:__int**gsl_sf_Chi_e***(double*`x`, gsl_sf_result *`result`)-
These routines compute the integral @math{ Chi(x) := Re[ \gamma_E + \log(x) + \int_0^x dt (\cosh[t]-1)/t] }, where @math{\gamma_E} is the Euler constant (available as the macro
`M_EULER`

).

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