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Cartesian

Cartesian
represents the Cartesian coordinate system with default variables Xx, Yy, and Zz.
Cartesian[x, y, z]
represents the Cartesian coordinate system with variables x, y, and z.
Needs["VectorAnalysis`"]
By default, all calculations are done in Cartesian coordinates:
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Use another coordinate system as the default:
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Reset Cartesian as the default:
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