\ifx\pdfunknown\relax
 \WARMprocessMMA{w8q3}{eps}{mbb}%
\else
 \WARMprocessMMA{w8q3}{pdf}{mbb}%
\fi
\renewcommand{\xyWARMinclude}[1]{\scaledfig{.7}{#1}}%
\begin{xy}
 \xyMarkedImport{}
% *\frm{-},\xyShowMarkPoints{*[red]@{x}}{-}
 \xyMarkedPos{anchor}*+!DL{(3,0.3)}
 \xyMarkedPos{tangent}*++!DL\txt\small{tangent line: $y=0.54-0.08x$}
 \xyMarkedPos{serpent}-(0,.05)*+!C[F-:red]\txt
  \large\bfseries{serpentine curve\\$y=x(1+x^2)^{-1}$}
\end{xy}