1 setxyrapport
1 setxunit
1 setborder
1 setangle_repere
-5 5 setxrange
-5 5 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/R {settvar
#rpn# 2+cos(t/2)
} def
0 4 pi mul settrange
gsave
.75 setlinewidth
continu
vert
(R) courbepolar
grestore
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