1 setxyrapport
25 setxunit
7.5 setborder
90 setangle_repere
-5 5 setxrange
-5 5 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/R {settvar
#rpn# cos(3*t)
} def
0 20 pi mul settrange
gsave
.75 setlinewidth
continu
bleu
(R) courbepolar
grestore
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