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parametric plot x(d) = sqrt(d^2/2 - 1/4)-1/2, y(d) = sqrt(d^2/2 - 1/4)+1/2
parametric plot x(d) = sqrt(d^2/2 - 1/4)-1/2, y(d) = sqrt(d^2/2 - 1/4)+1/2
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