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printf("hello world");
$f(x)=x$
$$
\lbrace \sum_{i=0}{n}i{2}=\frac{2a}{x^2+1} \rbrace
$$
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=default"></script>
printf("hello world");
$f(x)=x$
$$
\lbrace \sum_{i=0}{n}i{2}=\frac{2a}{x^2+1} \rbrace
$$
<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=default"></script>
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