InterviewSolution
`x in (n PI + (pi)/(2), n pi - tan ^(-1) 2) n in Z``x in ( n pi + (pi)/(4), n pi + tan^(-1) 2) n in Z``x in ( n pi - (pi)/(2), n pi + tan^(-1) 2) n in Z``x in (n pi - (pi)/( 4), n pi - tan^(-1) 2 ) n in Z`
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