ERFC function
Description
Complementary error function. ERFC(x) returns the error function integrated between x and infinity.
$$\operatorname{erfc}(x) = \frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,\mathrm dt $$
$$\operatorname{erfc}(x) = \frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,\mathrm dt $$ ERFC(x)=1-ERF(x)
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