在学习函数时,首先要学到自变量和函数用平面坐标系表示,一般平面直角坐标系横坐标轴为x轴,纵坐标轴为y轴.平面直角坐标系的坐标轴上均匀等分单位为1.平面极坐标系中极轴和极角都均匀等分,极轴均匀等分单位长度为1,极角均匀等分单位角度为1°.坐标轴上数值均匀等分特点是能够准确表达两个 When learning the function, we must first learn that the independent variables and functions are represented by the plane coordinate system, the general plan rectangular coordinate system is the x-axis and the y-axis is the y-axis. 1. Planar polar coordinate system polar axis and polar angle are equally divided, the polar axis evenly divided unit length of 1, uniform polar angle unit angle of 1. Equal points on the axis equal to the feature is able to accurately Express two