%% auteur : -5 5.5 setxrange -4 4 setyrange 30 setxunit traceOx xticks 0 xtick /A{0 0} def A point /B{5 0} def B point /cer{O 4} def %cer cercle /M{-60 cer cpoint} def M point /M'{M projx} def /C{4 0} def A M C arcp [A M] ligne /arrowscale {1.5 dup} def /arrowangle 8 def M A C 0.8 (<-) tripointarc setTimes (M) M drtext /cerc{O 3} def /N{150 cerc cpoint} def N point [A N] ligne /D{3 0} def A D N arcp /E{0 3} def [A E] ligne /N'{N projy} def /arrowangle -8 def D A N 1 (->) tripointarc #latex#$-\frac{\pi}{3}$ 1 -0.5 [1.5 1.5] cctexlabel #latex#$\frac{5\pi}{6}$ 1 1 [1.5 1.5] cctexlabel setTimes (A) A dtext (B) B dtext (N) N ltext (E) E utext (C) C utext pointilles [N N'] ligne [M M'] ligne A N' 2 marked N' E 2 marked