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If hati, hatj and hatk represent unit ve...

If `hati, hatj and hatk` represent unit vectors along the x, y and z-axes respectively, then the angle `theta` between the vectors `(hati+ hatj+hatk) and (hati+hatj)` is equal to :

A

`sin^(-1)((1)/(sqrt3))`

B

`sin^(-1)(sqrt((2)/(3)))`

C

`cos^(-1)((1)/(sqrt3))`

D

`90^(@)`

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