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sqrt((-((2+x)^2+(2-x)^2)^2-((1+x)^2+(3-x)^2)^2-2^2+2((2+x)^2+(2-x)^2)((1+x)^2+(3-x)^2)+2((2+x)^2+(2-x)^2)2+2((1+x)^2+(3-x)^2)2)/16)
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