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[" (c) "2cos2 theta],[" 65."sin^(2)(pi)/...

[" (c) "2cos2 theta],[" 65."sin^(2)(pi)/(18)+sin^(2)(pi)/(9)+sin^(2)(7 pi)/(18)+sin^(2)(4 pi)/(9)" is equal to "],[[" (a) "1," (b) "4," (c) "2," (d) "0]]

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