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How to understand dx in advanced mathematics
Two understandings of dx in different contents of advanced mathematics;

1. In the indefinite integral, dx is equivalent to a symbol, or dx represents the unit of integral, and the parameters after d are used as the unit of integral.

2. In the definite integral, dx is the differential of x, which can be understood as infinitesimal, and dx is equivalent to any x interval that is infinitely close to 0 but not equal to 0.