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[" 4.The value of "sin18^(@)" is "],[[" ...

[" 4.The value of "sin18^(@)" is "],[[" (a) "1+-sqrt((5)/(4))," (b) "-1+-sqrt((4)/(5))],[" (c) "+-sqrt((4)/(5))," (d) "(sqrt(5)-1)/(4)]]

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