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Source de Fig165.tex

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\begin{center}
\begin{pspicture}(-6,-6)(2,2)
\psline(-6,0)(2,0)
\uput[-90](-6,0){$x$}
\psline(0,2)(0,-6)
\uput[180](0,-6){$y$}
\psline(!6 30 cos mul neg 6 30 sin mul neg)
\psarc{->}(0,0){4}{180}{210}
\psarc{->}(0,0){5}{195}{225}
\uput[195](4;195){$\THETA$}
\psline(-2,-6)(-2,2)
\psdots(! 2 neg 2 30 dup sin exch cos div mul neg)
\psline{->}(-1.9,-5)(-0.5,-5)
\uput[180](-2,-5){F}
\uput[-20](! 2 neg 2 30 dup sin exch cos div mul neg){P}
\uput[135](0,0){C}
\uput[-90](!6 30 cos mul neg 6 30 sin mul neg){L}
\end{pspicture}
\end{center}