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16:48, 6 October 2014
<math>
\operatorname{erfc}
f
(x) =
\frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,dt =
\frac{e^{-x^2}}{x\sqrt{\pi}}
\sum_{n=0}^\infty
(-1)
a_n x
^n
\frac{(2n)!}{n!(2x)^{2n}}
</math>
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