`(2n+1)(PI)/4, 2n pi +-(2PI)/3, n inZ``(2n+1)(pi)/3, 2npi +-(pi)/4, n in Z``(2n+1)(pi)/6, 2n pi +-(2pi)/3, n in Z``(2n+1)(pi)/3, 2n pi +-(2pi)/3, n in Z`
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