If a line makes `30^(circ)` with the positive direction of `X`-axis, `angle beta` with the positive direction of `Y`-ax

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Q 2349023813.     If a line makes `30^(circ)` with the positive direction of
`X`-axis, `angle beta` with the positive direction of `Y`-axis and
` angle gamma` with the positive direction of `Z`- axis , then what
is `cos^2 beta + cos^2 gamma` equal to?
NDA 2013 Paper 1
A

`1/4`

B

`1/2`

C

`3/4`

D

`1`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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