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pdflatex doc4PDF doc4.pdf
xhlatex doc4 XHTML + bitmap math doc4.html
mzlatex doc4 XHTML + MathML math doc4.xml
oolatex doc4 OpenOffice (MathML math)doc4.sxw
\documentclass{article}  
\begin{document}  
   Hellow World! \(\sqrt{a^2+b^2} \over 2\)  
\end{document}  

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