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1-((2/pi) arctan (tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.1)))) )
1-((2/pi) arctan (tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.1)))) )
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