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If a,b,c,d are four vectors, then prove that (a×b).(c×d)+(b×c).(a×d)+(c×a).(b×d)=0

Answer» If a,b,c,d are four vectors, then prove that
(a×b).(c×d)+(b×c).(a×d)+(c×a).(b×d)=0


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