关于曲线的极坐标方程,多数同学感到困惑,虽也下了一番功夫,但稍一变化,便不知如何应付,灵活的同学将方程化为直角坐标方程,再做解答,有时变来变去,费了很多时间.本人就教学经验,介绍把握曲线极坐标方程的方法,相信同学们会有所得. 首先把握极坐标系下的几条线,几个圆. 1.五条线:(基本曲线)(ρ>0) (1)过极点的射线:θ=α·(ρ允许取负时为直线方程) Most of the students were puzzled about the polar coordinate equation of the curve. Although some efforts were made, they did not know how to cope with the slight changes. The flexible students transformed the equation into rectangular coordinate equations, and then answered them. Sometimes they changed. I spent a lot of time on teaching experience. I introduced the method of grasping the polar coordinate equation of the curve. I believe that my classmates will gain. First, I will grasp several lines and several circles under the polar coordinate system. 1. Five lines: (Basic curve ) (ρ>0) (1) Rays passing through the pole: θ=α·(ρ is allowed to take a negative equation)