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# -(1/2)*x^2+x+(7/2)
} def
/g {setxvar
#rpn# 3*x^2-12*x+12
} def
gsave
bleu
0.75 setlinewidth
continu
{f} courbe
grestore
gsave
rouge
0.75 setlinewidth
continu
-2 2 {g} courbe
grestore
#latex# $y=x^2$
3.5 4.25 [2 2] crtexlabel
#latex#$y=-x^2$
3.5 -3.25 [2 2] crtexlabel
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