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[" 32.If "a=cos((8 pi)/(11))+i sin((8 pi...

[" 32.If "a=cos((8 pi)/(11))+i sin((8 pi)/(11))" then "],[qquad [Re(a+a^(2)+a^(3)+a^(4)+a^(5))=],[1)0,sqrt(2)^(2)(-1)/(2)," 3) "(1)/(2)," 4) "]]

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