1.

(a xx b) . (a xx c) =

Answer»

(a.C) (b.c) - (a.b) (b.c)
(a.b) (b.c) - (a.b) (a.b)
(a.a) (b.c) - (a.b). (a.c)
(a.a) (b.b) - (a.b) (a.c)

ANSWER :C


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