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Bispherical

Bispherical
represents the bispherical coordinate system with default variables Uu, Vv, and Pphi and default parameter value 1.
Bispherical[u, v, ]
represents the bispherical coordinate system with variables u, v, and and default parameter value 1.
Bispherical[u, v, , a]
represents the bispherical coordinate system with variables u, v, and and parameter a.