Consider the following relations among the angles \alpha, \beta, \gamma made by a vectors with the coordinate axes: 1. \cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma=-1 2. \sin ^2 \alpha+\sin ^2 \beta+\sin ^2 \gamma=1 Which of the above is\/are correct?

UPSC NDA I 2011 Mathematics Paper

Question : 44 of 120

Marks: +1, -0

Consider the following relations among the angles α, β,γ made by a vectors with the coordinate axes:
1. cos‌2‌α+cos‌2‌β+cos‌2‌γ=−1
2. sin2α+sin2β+sin2γ=1
Which of the above is\/are correct?

1 only
2 only
Both 1 and 2
Neither 1 nor 2

Validate

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