If \( 3 \sin \beta=\sin (2 \alpha+\beta) \), then :
(a) \( (\cot \alpha+\cot (\alpha+\beta))(\co...
If \( 3 \sin \beta=\sin (2 \alpha+\beta) \), then :
(a) \( (\cot \alpha+\cot (\alpha+\beta))(\cot \beta-3 \cot (2 \alpha+\beta))=6 \)
(b) \( \sin \beta=\cos (\alpha+\beta) \sin \alpha \)
(c) \( \tan (\alpha+\beta)=2 \tan \alpha \)
(d) \( 2 \sin \beta=\sin (\alpha+\beta) \cos \alpha \)
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