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

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

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