The vectors `vec(AB)=3hati+2hat+2hatk and vec(BC)=-hati-2hatk` are the adjacent sides of

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The vectors `vec(AB)=3hati+2hat+2hatk and vec(BC)=-hati-2hatk` are the adjacent sides of parallelogram. The angle between its diagonal is (A) `pi/3` (B) `pi/4` (C) `(3pi)/4` (D) (2pi)/3`
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