If `vec(A)` and `vec(B)` are two such vectors that `|vec(A)| = 2, |vec(B)| = 7` and `vec(A

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If `vec(A)` and `vec(B)` are two such vectors that `|vec(A)| = 2, |vec(B)| = 7` and `vec(A) xx vec(B) = 3 hati +2 hatj + 6 hatk`, find the angle between `vec(A)` and `vec(B)`.
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