40 setxunit
7.5 setborder
-4 4 setxrange
-3 3 setyrange
jpegmode
/k 10 def
      
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
1.75 setlinewidth
continu
bleu
/X {settvar
    2 t Cos mul k t mul Cos sub
} def
/Y {settvar
    1 t Sin mul 4 t mul Sin sub
} def
  0  2 pi mul {X} {Y} Courbeparam