floor(x/(2pi))sqrt(2)pi+pi/sqrt(2)-sqrt(2)*arctan((1-3tan((x-pi-2pi*floor(x/(2pi)))/2))/sqrt(2))floor(x/(2pi))sqrt(2)pi+pi/sqrt(2)-sqrt(2)*arctan((1-3tan((x-pi-2pi*floor(x/(2pi)))/2))/sqrt(2))

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