vec(a)=2hati+hatj+hatk and vec(b)=hati-h...

`vec(a)=2hati+hatj+hatk` and `vec(b)=hati-hatj-hatk` are the adjacent sides of a parallelogram. The angle between their diagonals is ………………

A

`cos^(-1)((1)/(3))`

B

`cos^(-1)((1)/(2))`

C

`cos^(-1)((4)/(9))`

D

`cos^(-1)((5)/(9))`

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The correct Answer is:

A

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