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Trigonometry doubt

Let A and B denote the satements

**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

(a) Both **A** and **B** are true

(b) Both **A** and **B** are false

(c) **A** is true and **B** is false

(d) **A** is false and **B** is true

Updated Fri, 31 May 2019 05:28 pm

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