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Question

Let ¯a,¯b,¯c three non-zero vectors such that ¯c is a unit vector right angle to both ¯a and ¯b are inclined at π6 then [¯a¯b¯c]2 is

A
34|¯a|2¯b2
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B
14|¯a|2¯b2
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C
1
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D
0
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