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based on an earlier version of the Wolfram Language.
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Cartesian


represents the coordinate system with default variables Xx, Yy, and Zz.

represents the coordinate system with variables x, y, and z.
By default, all calculations are done in Cartesian coordinates:
Use another coordinate system as the default:
Reset as the default:
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 as the default:
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