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\title{An Example Document} 
\author{Ken Takusagawa\\kenta@cs.stanford.edu} 
\date{January 21, 1994} 

\newcommand{\vecc}[1]{\ensuremath{\stackrel{\rightarrow}{#1}}}
\begin{document} 

\begin{eqnarray*}
x^2+y^2+z^2&=&R\\
D_x : 2x+2y\frac{dy}{dx}+2z\frac{dz}{dx}&=&0\\
\frac{
\end{eqnarray*}


\end{document}
