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[" 9.If "cos alpha+2cos beta+3cos gamma=...

[" 9.If "cos alpha+2cos beta+3cos gamma=sin alpha+2sin beta+3sin gamma=0],[" then the value of "sin3 alpha+8sin3 beta+27sin3 gamma" is "],[[" a."sin(a+b+gamma)," b."3sin(alpha+beta+gamma)],[" c."18sin(alpha+beta+gamma)," d."sin(alpha+2 beta+3)]]

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