If the angles make by a straight line with the coordinate axes are `alpha,pi/2-alpha,beta` then `beta=`

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Q 1163667545.     If the angles make by a straight line with the coordinate axes are

`alpha,pi/2-alpha,beta`

then `beta=`
EAMCET 2011
A

`0`

B

`pi/6`

C

`pi/2`

D

`pi`

HINT

Use `cos^2alpha+cos^2beta+cos^2gamma=1` where `alpha`, `beta` and `gamma` are angles of a line which makes from the coordinate axes.

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

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