1. The idea of analogizing rectangular coordinates? Understand the idea of polar coordinates? Use this idea to establish a polar coordinate system? Understand the uniqueness of polar coordinates of points?

2. Learn to use polar coordinates to represent points on the plane?

3. Understand the problem of using polar coordinates to describe the position system of points on the plane to find the curve equation.

4? Master the reciprocal relationship between polar coordinates and rectangular coordinates?

5? Will realize the reciprocity of polar coordinates and rectangular coordinates.

1, grasp the basic properties of real number size? Understand the mean value theorem and its application? Understand the concept of inequality and prove simple inequality by comparison and synthesis.

2. Understand the meaning of inequality solution set? Master the one-dimensional inequality? Group? , a quadratic inequality? The solution of inequality with absolute value? Understanding the application of inequalities and inequality groups in practical problems.