_cacos_sub _cacosh_sub _casin_sub _casinh_sub _catan_sub _catanh_sub _ccos_sub _ccosh_sub _ccot _ccot_sub _cexp_sub _cexpm1 _cexpm1_sub _clog1p _clog1p_sub _clog_sub _csin_sub _csinh_sub _ctan_sub _ctanh_sub

_cexpm1_sub() void _cexpm1_sub ( double _Complex  z, double _Complex *  expm1z  ) exp(z)-1 of complex number Purpose cexpm1_sub evaluates exp(z) - 1 accurately in the sense of relative error when z is very small. Parameters [in] z Complex argument z. [out] expm1z exp(z) - 1. Error handling Range error (ERANGE) may occur.