-4 2 setxrange
-2 4 setyrange
.5 .5 setquadrillagestep
quadrillage
traceaxes
axesarrow
1 xmark
1 ymark
/f {
setxvar
x 1 sub
2 x mul Exp mul
} def
medium setlinewidth
{f} courbe
setTimesItalic
(O) O dltext
(C) -3 dup f dltext
(x ) xmax 0 dltext
(y ) 0 ymax dltext
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