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A unit radial vector hatr makes angles o...

A unit radial vector `hatr` makes angles of `alpha = 30^(@)` relative to the x-axis, `beta = 60^(@)` relative to the y-axis, and `gamma = 90^(@)` relative to the z-axis. The vector `hatr` can be written as :

A

`(1)/(2)hati+ (sqrt3)/(2)hatj`

B

`(sqrt3)/(2) hati+ (1)/(2) hatj`

C

`(sqrt2)/(3)hati+ (1)/(sqrt3) hatj`

D

None of these

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