Let `vec(A) , vec(B)` and `vec(C)` be unit vectors. Suppose that `vec(A) * vec(B) = vec(A) * vec(C)= 0` and that

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Q 2211012820.     Let `vec(A) , vec(B)` and `vec(C)` be unit vectors. Suppose that

`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) = k ( vec(B) xx vec(C) )1 and `k` is equal to
A

`pm 2`

B

`pm 4`

C

`pm 6`

D

`0`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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