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What is the content of senior high school mathematics elective 4-4?
If you're talking about PEP.

The first lecture on coordinate system

rectangular coordinates/ cartesian coordinates

Bipolar coordinate system

Polar coordinate equations of three simple curves

Brief introduction of four-column coordinate system and spherical coordinate system

Lecture 2 parametric equation

Parametric equation of curve

Parametric equation of conic curve

Parametric equation of three straight lines

Four involute and cycloid