InterviewSolution
` N PI + ( - 1)^(n) (pi)/( 6) , n in Z`` n pi + ( - 1)^(n) (pi)/( 3) , n in Z`` n pi + ( - 1)^(n) ( 2 pi)/( 3) , n in Z`` n pi + ( - 1)^(n) (5 pi)/( 6) , n in Z`
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