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[" 2.If "cos^(3)alpha+cos^(3)(120^(@)+al...

[" 2.If "cos^(3)alpha+cos^(3)(120^(@)+alpha)+cos^(3)(120^(@)-alpha)=(3sqrt(3))/(4)," then "alpha" is "],[qquad [" () "phi," 2) "2n pi+-(pi)/(3),n in z," 3) "(2n+1)(pi)/(2)n in Z," 4) "n pi,n]]

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