InterviewSolution
`NPI+(-1)^(n)(pi)/(4)``npi+(-1)^(n)(pi)/(6)` `npi+(-1)^(n)(pi)/(6)ornpi+(-1)^(n)(pi)/(3)` `npi+(-1)^(n)(pi)/(2)ornpi+(-1)^(n)(pi)/(6)`
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