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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 24 (Section 7.8 : Série de tangentes)
\begin{tikzpicture}[scale=2]
\tikzstyle{tan style}=[-]
\tkzInit[xmin=-5,xmax=2,ymin=-1,ymax=3]
\tkzDrawXY
\tkzText[draw,color = red, fill = orange!20](1.5,1.5){$y = xe^x$}
\tkzFct[line width = 0.01 pt,color = red, domain = -5:1]{x*exp(x)}
\foreach \x in {-4,-3.8,...,0}{%
\tkzDrawTangentLine[color=blue,line width=.4pt,kr=1,kl=0.5](\x)}
\foreach \x in {0.6,0.8,1}{%
\tkzDrawTangentLine[color=blue,line width=.4pt, kr=0,kl=0.5](\x)}
\end{tikzpicture}
\end{document}
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