ErfC(x) Complementary Error Function

By definition,
ErfC(x) = 1 – Erf(x).

If x >= 0, ErfC(x) = GamQ(1/2, x^2),
where GamQ(x, y) is the upper regularized incomplete Gamma function (see the GamQ(x, y) function).

If x < 0, ErfC(x) = 2 − ErfC(−x).

See: Erfc -- From MathWorld
And: Wolfram Function Evaluation -- Erfc
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