Test

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Math test



\operatorname{erfc}(x) =
\frac{2}{\sqrt{\pi}} \int_x^{\infty} e^{-t^2}\,dt =
\frac{e^{-x^2}}{x\sqrt{\pi}}\sum_{n=0}^\infty (-1)^n \frac{(2n)!}{n!(2x)^{2n}}

Math test


Iframe test


Iframe test

Geshi test


 
<?php
     $v = "string";    // sample initialization
?> html text 
<?   echo $v;          // end of php code 
?>

GeShi test