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+\documentclass[a4paper,12pt]{report}
+\usepackage{german,pstricks,pst-plot,pst-node}
+\usepackage[latin1]{inputenc}
+\begin{document}
+
+Näherung der Ableitung durch eine Sekante.
+
+\psset{unit=6mm}
+\begin{center}\pspicture(0,-1)(10,8)\small
+ \psaxes{->}(10,8)
+ \psplot[linewidth=2\pslinewidth,linecolor=red]
+ {0.5}{8}{x dup mul 6 64 div mul 2 add}
+ \psline[linestyle=dotted](2,0)(2,3)
+ \psline[linestyle=dotted](6,0)(6,6)
+ \psline[linewidth=.5\pslinewidth](1,2.1)(7,6.6)
+ \psline[linewidth=.5\pslinewidth](1,1.25)(7,5.75)
+ \rput[l](5.8,5.8){\rnode{S}{}}
+ \rput[l](8,7){\rnode{Se}{Sekante}}
+ \rput[l](7.5,5.5){Tangente $\approx f'(x)$}
+\endpspicture\end{center}
+
+\nccurve[angleA=120,angleB=80]{->}{Se}{S}
+
+\end{document} \ No newline at end of file