_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() double _Complex _cexpm1 ( double _Complex  z ) exp(z) - 1 of complex number Purpose cexpm1 evaluates exp(z) - 1 accurately in the sense of relative error when z is very small. Returns exp(z) - 1. Parameters [in] z Complex argument z. Error handling Range error (ERANGE) may occur.