The vector vec(AB)=3hati+2hatj+2hatk and...

The vector `vec(AB)=3hati+2hatj+2hatk` and `vec(BC)= - hati-2hatk` are adjacent sides of a parallelogram ABCD the angle between the diagonals is :

`(pi)/(4)`

`(pi)/(3)`

`(2pi)/(3)`

`(3pi)/(4)`

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