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[" 11.If "a(k)=cos alpha(k)+i sin alpha(...

[" 11.If "a_(k)=cos alpha_(k)+i sin alpha_(k),k=1,2,3" and "],[a_(1),a_(2),a_(3)" are the roots of the equation "],[x^(3)+bx+c=0," then the real part of "],[b=],[[" 1) "-1," 2) "1," 3) "0," 4) "(2)/(3)]]

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