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

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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