`n pi + (pi)/( 2) LT theta lt n pi + (pi)/( 4) , n in Z``n pi + ( 3 pi)/( 2 ) lt theta lt n pi + (5 pi)/( 4) , n in Z``n pi + (pi)/(4) lt theta lt n pi + (3 pi)/( 4) , n in Z``n pi + (3 pi)/( 4) lt theta lt n pi + (5 pi)/( 4) , n in Z`
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