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[" Q.21"3tan^(6)(pi)/(18)-27tan^(4)(pi')...

[" Q.21"3tan^(6)(pi)/(18)-27tan^(4)(pi')/(18)+33tan^(2)(pi)/(18)" equals - "],[[" (A) "0," (B) "1],[" (C) "2," (D) "3]]

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