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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 19 (Section  7.3 : Les options \tkzname{kl}, \tkzname{kr} et l'option \tkzname{draw})

  \begin{tikzpicture}[scale=1.5]
   \tkzInit[xmin=-3,xmax=4,ymin=-4,ymax=2]
   \tkzGrid   \tkzDrawXY \tkzClip
   \tkzFct[domain = -2.15:3.2]{(-x*x)+2*x}
   \tkzDefPointByFct[draw](2)
   \tkzDrawTangentLine[kl=0,draw](-1)
   \tkzDrawTangentLine[draw](1)
   \tkzDrawTangentLine[kr=0,draw](3)
   \tkzRep
\end{tikzpicture}

\end{document}