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

% Ex. No. 67 (Section 14.7.2 :  Première courbe avec $ b=1$)

	 \begin{tikzpicture}[xscale=2,yscale=2.5]
	    \tkzInit[xmin=0,xmax=6,ymax=0.5,ystep=0.1]
	    \tkzDrawX[label=$v$]
	    \tkzDrawY[label=$g(v)$]
	    \tkzGrid(0,0)(6,0.5)
	    \tkzFct[color   = red,domain =1:6]{(2*(x-1)*(x-1))/(x*x*x)}
	    \tkzDrawTangentLine[color=blue,draw](3)
	    \tkzDefPointByFct(1)
	    \tkzText[draw, fill = brown!30](4,0.1){$g(v)=2\dfrac{(v-1)^2}{v^3}$}
	 \end{tikzpicture}

\end{document}