25 setxunit
7.5 setborder
90 setangle_repere
-10 10 setxrange
-4 8 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*x-4*x+3
} def
gsave
bleu
.75 setlinewidth
continu
{f} courbe
grestore
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