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Question

For any 3 vectors ab and c prove that
[a+bb+cc+a]=2[abc]

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Solution

Since,(a+b)×(b+c)=a×b+a×cNow,letE=[a+bb+cc+a]E=[a×b+a×c+b×c](c+a)E=[abc]+[abc]E=2[abc]

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