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

\begin{document}

\begin{tikzpicture}[scale=1.25]
 \tkzInit[ymin=-1,xmax=5,ymax=3]
 \tkzGrid
 \tkzAxeXY
 \tkzFct[domain = 0.5:5]{1/x}% courbe a
 \tkzFct[domain = 1:5]{log(x)}% courbe b
 \tkzDrawAreafg[between=b and a,
            color=magenta!50,
            domain = 1:4]
\end{tikzpicture}

\end{document} 
