-2 2 setxrange
-2 2 setyrange
/X {settvar
t Cos t Sin dup mul sub
} def
/Y {settvar
t Sin t Cos 1 add mul
} def
0 2 pi mul settrange
continu
/dessin {
tracerepere
marks
1 dict begin
1.5 setlinewidth
gsave
bleu
{X} {Y} courbeparam
grestore
end
} def
{dessin} relief
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