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[" 88.The value of "sin(5)/(7)" is "(2 p...

[" 88.The value of "sin(5)/(7)" is "(2 pi)/(7)sin(3 pi)/(7)" ,is "],[[" (a) "1/8," (b) "sqrt(7)/8," (c) "sqrt(7)/2," (d) "sqrt(7)/16]]

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