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[" (iii) "(sim...)/(sin8x+2sin11x+sin14x...

[" (iii) "(sim...)/(sin8x+2sin11x+sin14x)-sin11x],[" 17.Prove that ":cos alpha+cos beta+cos gamma+cos(alpha+beta+gamma)=4cos(alpha+beta)/(2)cos(beta+gamma)/(2)cos(gamma+alpha)/(2)],[1]

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