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sqrt((-0.56-h)^2/(1-((4.95-k)^2/(2.20-k)^2)/(1-(-3.83-h)^2/a^2))
sqrt((-0.56-h)^2/(1-((4.95-k)^2/(2.20-k)^2)/(1-(-3.83-h)^2/a^2))
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