为简化极坐标方程f(ρ,θ)=0的作图,往往先要就方程对曲线的对称性加以讨论,通常给出的判断条件为f(P,0)二f(P,一0)或f(P,0)二f(一p,二’0)f(p,6)二f(一p,一0)或f(p,0)若f(p,二一0)f(p,0)二f(一p,0)·或f(p,0)二f(p,二+0)曲线的对称性对称于极轴对称于极垂轴对称于极点利用表中所列条件判断曲线f(p,0)=o是否具有某种对称性 In order to simplify the mapping of the polar coordinate equation f(ρ, θ)=0, the symmetry of the curve of the equation is often discussed first. The judgment condition given is usually f(P,0)f(P,0). ) or f(P,0)f(p,2’0)f(p,6)f(p,0) or f(p,0) if f(p,20%)f (p,0) Two f(-p,0) or f(p,0) Two f(p, two+0) curves Symmetry Symmetry Symmetry in the polar axis Symmetry in the polar axis Symmetry in the pole The column condition determines whether the curve f(p, 0) = o has some symmetry