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sqrt( (sin(2*pi*y/x)*x)^2+ (-cos(2*pi*y/x)*x+x+1-cos(2*pi*x))^2)=0
sqrt( (sin(2*pi*y/x)*x)^2+ (-cos(2*pi*y/x)*x+x+1-cos(2*pi*x))^2)=0
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