25 setxunit
7.5 setborder
90 setangle_repere
-3 3 setxrange
-5 5 setyrange
/quadrillagegray 0.4 def
1 setquadrillagexstep
1 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
unites
/f0 {setxvar
#rpn# x^2
} def
/f1 {setxvar
#rpn# -x^2
} def
gsave
rouge
0.75 setlinewidth
continu
{f0} courbe
grestore
gsave
bleu
0.75 setlinewidth
continu
xmin .01 neg {f1} Courbe
.01 xmax {f1} Courbe
grestore
#latex# {\footnotesize{$x^2$}}
1.75 3.5 [2 2] crtexlabel
#latex# {\footnotesize{$-x^2$}}
-2 2 [2 2] crtexlabel
#latex# {\footnotesize{$a>0$}}
-2 2 [2 2] crtexlabel
#latex# {\footnotesize{$a<0$}}
2 -2 [2 2] crtexlabel
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