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129 bytes removed, 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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