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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 23 (Section 7.7 : Demi-tangentes Courbe de Lorentz )
+
+\begin{tikzpicture}[scale=1.25]
+ \tkzInit[xmax=1,ymax=1,xstep=0.1,ystep=0.1]
+ \tkzGrid(0,0)(1,1)
+ \tkzAxeXY
+ \tkzFct[color = red,thick, domain =0:1]{(exp(\x)-1)/(exp(1)-1)}
+ \tkzSetUpPoint[size=6]
+ \tkzDrawTangentLine[draw, kl = 0, kr = 0.4](0)
+ \tkzDrawTangentLine[draw, kl = 0.4,kr = 0 ](1)
+ \tkzText[draw,color = red,fill = orange!20](0.5,0.6)%
+ {$f(x)=\dfrac{\text{e}^x-1}{\text{e}-1}$}
+\end{tikzpicture}
+
+\end{document}