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Dans le plan muni d'un repère orthonormé
(

,


,


)
(O,
i
,
j

), on considère les points

(

1
;
2
)
A(−1;2),

(
1
;

3
)
B(1;−3) et

(
4
;
4
)
C(4;4).
1) Les coordonnées des vecteurs



AB
et



AC
sont :