20 setxunit
-8 5 setxrange
-5 4 setyrange
quadrillage
gsave
orange
3 setlinewidth
[xmin 0 3 sqrt neg 0] ligne
[xmax 0 3 sqrt 0] ligne
grestore
tracerepere
2 setxmkstep
xmarks
/f {
1 add dup mul neg 3 add
} def
{f} courbe
{-2 mul 1 sub} courbe
/fontsize 10 store
/dotscale {.8 dup} def
[3 sqrt dup neg] {dup f} apply dashpoints
setTimesItalic
(x) xmax 0 dltext
(y) 0 ymax dltext
<tex>
$$
y = -x^2 -2x + 2
$$
</tex>
-3.5 dup f ultexlabel
<tex>
$\displaystyle {\phantom \int y = -2x - 1}$
</tex>
-2 3 bltexlabel
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