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[http://en.wikibooks.org/wiki/LaTeX/Mathematics '''Use this website for formula'''
[http://en.wikibooks.org/wiki/LaTeX/Mathematics '''Use this website for formula''']
<math>
<math>
\operatorname{erfc}(x) =
\operatorname{erfc}(x) =
<math>{\pi}r^2</math>
<math>{\pi}r^2</math>
<math>4{\pi}{\epsilon}r^2</math>