-6 6 setxrange
-2 6 setyrange
quadrillage
.7 setlinewidth
tracerepere
/f {1 exch div} def
/A {2 3 sqrt sub dup f} def
/B {2 3 sqrt add dup f} def
1.2 setlinewidth
1 ymax div xmax (f) Courbe
xmin 1 ymin div (f) Courbe
(neg 4 add) courbe
<tex>
$\vec \imath $
</tex>
.4 -.1 [1.5 dup] dctexlabel
<tex>
$\vec \jmath $
</tex>
-.1 .2 [1.5 dup] ultexlabel
<tex>
$\cal D$
</tex>
-2 5 [1.2 dup] urtexlabel
<tex>
$\cal H$
</tex>
-5 -.8 [1.2 dup] urtexlabel
[A B] dashpoints
setTimesItalic
(x) xmax 0 (-10 0) dltext
(y) 0 ymax (0 -10) dltext
(A) A urtext
(B) B urtext
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