25 setxunit
7.5 setborder
90 setangle_repere
-4 5 setxrange
-4 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
/f {setxvar
#rpn# x^2
} def
/g {setxvar
#rpn# -x^2
} def
gsave
bleu
0.75 setlinewidth
continu
{f} courbe
grestore
gsave
rouge
0.75 setlinewidth
continu
xmin .01 neg {g} Courbe
.01 xmax {g} Courbe
grestore
#latex# {\relsize{-1}{$x^2$}}
1.5 2.25 [2 2] crtexlabel
#latex# {\relsize{-1}{$-x^2$}}
-1.5 -2.25 [2 2] crtexlabel
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