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[" 13.The value of "sin((pi)/(18))sin((5...

[" 13.The value of "sin((pi)/(18))sin((5 pi)/(18))sin((7 pi)/(18))" is "],[[" (A) "(1)/(16)," (B) "(1)/(8)," (C) "-(1)/(9)," (D) "]]

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