__Function:__double**gsl_sf_erfc***(double*`x`)__Function:__int**gsl_sf_erfc_e***(double*`x`, gsl_sf_result *`result`)- These routines compute the complementary error function @math{erfc(x) = 1 - erf(x) = (2/\sqrt(\pi)) \int_x^\infty \exp(-t^2)}.

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