40 setxunit
7.5 setborder
90 setangle_repere
-3 3 setxrange
-4 4 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f {setxvar
#rpn#   x^2
} def
gsave
   bleu
   1 setlinewidth
   continu
   {f} courbe
grestore
1 setlinewidth
continu
bleu
/X {settvar
#rpn#   Cos (t)
} def
/Y {settvar
#rpn#   -2+Sin (t)
} def
 0 2 pi mul  {X} {Y} Courbeparam
/t1 {setxvar
#rpn#   2*sqrt(4+sqrt(13))*x-(4+sqrt(13))
} def
gsave
   rouge
   .75 setlinewidth
   pointilles
   {t1} courbe
grestore
/t2 {setxvar
#rpn#   2*sqrt(4-sqrt(13))*x-(4-sqrt(13))
} def
gsave
   rouge
   .75 setlinewidth
   pointilles
   {t2} courbe
grestore/t3 {setxvar
#rpn#   2*(-sqrt(4+sqrt(13)))*x-(4+sqrt(13))
} def
gsave
   rouge
   .75 setlinewidth
   pointilles
   {t3} courbe
grestore/t4 {setxvar
#rpn#   2*(-sqrt(4-sqrt(13)))*x-(4-sqrt(13))
} def
gsave
   rouge
   .75 setlinewidth
   pointilles
   {t4} courbe
grestore