1.

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

Answer»

`cos^(-1)((1)/(3))`
`cos^(-1)((1)/(2))`
`cos^(-1)((4)/(9))`
`cos^(-1)((5)/(9))`

Answer :A


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