`X in (npi+(pi)/3, N pi +(pi)/2)uu(npi -(pi)/3, npi+(pi)/4), NIN Z` `x in (n pi+(pi)/4, npi+(pi)/2)uu(npi-(pi)/4, n pi+(pi)/4),n in Z` `x in (n pi -(pi)/6, n pi+(pi)/2)uu(n pi -(pi)/4, npi +(pi)/4), n in Z` `x in (n pi -(pi)/3, n pi+(pi)/2)uu(n pi -(pi)/4, npi +(pi)/4), n in Z`