A) \[\text{2 cos}\alpha \text{ cos}\beta \text{ cos }\gamma \]
B) \[\text{2sin}\alpha \text{ sin}\beta \text{ sin }\gamma \]
C) \[x\cos \theta =y\cos \left( \theta +\frac{2\pi }{3} \right)=z\cos \left( \theta +\frac{4\pi }{3} \right)\]
D) none of these
Correct Answer: A
Solution :
\[b\text{ }sin\text{ }A=a,\text{ }A<\pi /2\](by Sine-rule)
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