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Bipolar

Bipolar
represents the bipolar coordinate system with default variables Uu, Vv, and Zz and default parameter value 1.
Bipolar[u, v, z]
represents the bipolar coordinate system with variables u, v, and z and default parameter value 1.
Bipolar[u, v, z, a]
represents the bipolar coordinate system with variables u, v, and z, and parameter a.