-2 3 setxrange
-2.5 2.5 setyrange
150 setwidth
150 setheight
/A {2 2} def
/B {1 pi 5 mul 6 div polcar} def
/C {1 3 sqrt neg} def
/dt 20 def
.5 .5 setquadrillagestep
quadrillage
traceaxes
axesarrow
marks
unites
[A B C] (times2) plot
O B angle dt sub
O B angle dt add
O 1 Cercle
O C angle dt sub
O C angle dt add
O 2 Cercle
pointilles
[B B projy] ligne
setTimesItalic
(A) A rtext
(B) B ultext
(C) C drtext
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