%
% tkz-euclide (14/01/2011)
%
% Coding (utf8) Creator (TeX) Producer (pdfeTeX) 
% Author Alain Matthes
\input{tkzfctpreamble.ltx}

\begin{document}

         \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} 
