Let A and B denote the statements A: \cos \alpha+\cos \beta+\cos \gamma=0 B: \sin \alpha+ \sin \beta+ \sin \gamma=0 If \cos (\beta-\gamma)+\cos (\gamma-\alpha)+\cos (\alpha-\beta)=-\frac{3}{2}, then: [AIEEE 2009]

Correct Answer is : both A and B are true

Trigonometric Ratios and Identities

Section: Mathematics

Question : 61 of 64

Marks: +1, -0

Let A and B denote the statements
A: cos‌α+cos‌β+cos‌γ=0
B: sin‌α+sin‌β+sin‌γ=0
If cos(β−γ)+cos(γ−α)+cos(α−β)=−‌

, then:

[AIEEE 2009]

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