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Let vec(A), vec(B) and vec(C ) be unit v...

Let `vec(A), vec(B) and vec(C )` be unit vectors. Suppose `vec(A).vec(B) = vec(A).vec(C ) = 0` and that the angle between `vec(B) and vec(C )` is `(pi)/(6) " then " vec(A) = +- n[vec(B) xx vec(C )]` find the n

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