100 setxunit
20 setborder
90 setangle_repere
-1.5 1.5 setxrange
-.5 1.5 setyrange
/quadrillagegray 0.05 def
0.5 setquadrillagexstep
0.5 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/X {settvar
    t Sin
} def
/Y {settvar
    t Cos 2 exp 2 t Cos sub div
} def
  0  2 pi mul settrange
gsave
   .75 setcurvelinewidth
   continu
   noir
   {X} {Y} courbeparam
grestore