Let a=a1i+a2j+a3k,b=b1i+b2j+b3k, and c=c1i+c2j+c3k be three non-zero vectors such that c is unit vector perpendicular to both vectors a and b. If the angle between vectors a and b is π6, then ∣∣
∣∣a1a2a3b1b2b3c1c2c3∣∣
∣∣2 is equal to
A
0
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B
1
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C
14(a21+a22+a23)(b21+b22+b23)
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D
34(a21+a22+a23)(b21+b22+b23)(c21+c22+c23)
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Solution
The correct option is C14(a21+a22+a23)(b21+b22+b23) We have, ∣∣
∣∣a1a2a3b1b2b3c1c2c3∣∣
∣∣2=[abc]2=[(a×b).c]2