ReliaWiki:General disclaimer
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Disclaimers [math]\displaystyle{ \sqrt{1-e^2} }[/math]
[math]\displaystyle{ \begin{eqnarray} &=&\frac{45+55}{2}-\frac{25+35}{2} \\ &=&50-30 \\ &=&20 \end{eqnarray} }[/math]