Q 1723367241.     Let a vector r make angles `60^0`,
`30^0` with `X` and `Y`-axes, respectively.

What are the direction cosines `r`?

NDA 2014 Paper 1 April
A

`< 1/2 , sqrt(3)/2 , 0 >`

B

`< 1/2 , - sqrt(3)/2 , 0 >`

C

`< 1/sqrt(2) , 1/sqrt(2) , 0 >`

D

`< -1/2 , sqrt(3)/2 , 0 >`

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