The direction cosines of the vector hati...

The direction cosines of the vector `hati-5hatj+8hatk` are

A

`((1)/(sqrt10),(-5)/(sqrt10),(8)/(sqrt10))`

B

`((1)/(3sqrt10),(-5)/(3sqrt10) ,(8)/(3sqrt10))`

C

`((1)/(3),(-5)/(3),(8)/(3))`

D

`((-1)/(3sqrt10),(-1)/(3sqrt10),(1)/(3sqrt10))`

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