x == (1/2) (a + Sqrt[a^2 - 4 b]) Cot[JacobiAmplitude[-((Sqrt[2] z)/Sqrt[(a - Sqrt[a^2 - 4 b])/b]), (2 Sqrt[a^2 - 4 b])/(a + Sqrt[a^2 - 4 b])]]^2 /; {x, y} == EllipticExp[z, {a, b}]

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2001-10-29