bug in preview.sty

[Herbert Voss]

this seems to be a bug in preview.sty.
the relevant latex code is

\begin{eqnarray}
y & = & d\label{eq:2}\\
y & = & cx+d\\
y & = & bx^{2}+cx+d\\
y & = & ax^{3}+bx^{2}+cx+d\label{eq:5}
\end{eqnarray}



HErbert
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