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    Distance formula in hyperbolic metric

    Hi! I'm trying to derive the hyperbolic distance formula for the upper-half plane model. It is given here: http://en.wikipedia.org/wiki/Poincar%C3%A9_half-plane_model" [Broken] I have the first formula, (ds)2= ... But I can't figure out how they got the distance formula below it. I...
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