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The vectors vec(AB)=3hati+2hat+2hatk and...

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`

A

`pi//4`

B

`pi//3`

C

`pi//2`

D

`2pi//3`

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