Elective 4-4: Coordinate System and Parameter Equation

Elective course 4- 1

Are there any elective courses 4-4 with moderate difficulty? Coordinate system: rectangular coordinate system, polar coordinate system, cylindrical coordinate system and spherical coordinate system.

? Parametric equation: that is, the function of compulsory elective middle school and the parametric equation of conic curve.

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This is very, very difficult.

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There are two books, no matter which province you are from, you must learn:

Elective courses 1- 1: logic, conic curve and derivative, the latter two are more difficult.

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Elective course 1-2: proof, statistics, block diagram, complex number, the last one is more difficult.