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Let bar(a), bar(b), bar(c ) be unit vect...

Let `bar(a), bar(b), bar(c )` be unit vectors, suppose that `bar(a). bar(b) = bar(a). bar(c )= 0` and the angle between `bar(b) and bar(c )` is `pi//6` then show that `bar(a)= +-2 (bar(b) xx bar( c))`

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