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JEEMAIN and NEET
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Mathematics
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Class11
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Complex Numbers and Quadratic Equations
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Q)
If $\cos\theta+2\cos\alpha+3\cos\beta=\sin\theta+2\sin\alpha+3\sin\beta=0$, then $\sin\;3\theta+8\sin\;3\alpha+27\sin\;3\beta=?$
(A) $9\;\sin(\theta+\alpha+\beta)$ (B) $18\;\sin(\theta+\alpha+\beta)$ (C) $18\;\cos (\theta+\alpha+\beta)$ (D) $9\;\cos (\theta+\alpha+\beta)$
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