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### Question Asked by a Student from EXXAMM.com Team

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

`alpha,pi/2-alpha,beta`

then `beta=`

**EAMCET 2011 **

#### 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.