Mathematica: How to approximate an implicit function using simple functions (e.g. polynomials)?

How to approximate an implicit function using simple functions (e.g. polynomials)?
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(mathematica.stackexchange.com/users/85242/johnson)Johnson
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series-expansion approximation

Видео Mathematica: How to approximate an implicit function using simple functions (e.g. polynomials)? канала Peter Schneider