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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, Phi]
represents the bispherical coordinate system with variables u, v, and Phi and default parameter value 1.
Bispherical[u, v, Phi, a]
represents the bispherical coordinate system with variables u, v, and Phi and parameter a.
Needs["VectorAnalysis`"]
Use Bispherical as the default coordinate system:
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All evaluations now use bispherical coordinates as the default:
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Reset the default coordinate system to Cartesian:
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