(1)表明因變量圖像的對稱性,即表明圖像上大肆點(diǎn)對于對稱重心(對稱軸)的對稱點(diǎn)仍在圖像上;
(2)表明圖像C1與C2的對稱性,即表明C1上大肆點(diǎn)對于對稱重心(對稱軸)的對稱點(diǎn)仍在C2上,反之亦然;
(3)弧線C1:f(x,y)=0,對于y=x+a(y=-x+a)的對稱弧線C2的方程為f(y-a,x+a)=0(或f(-y+a,-x+a)=0);
(4)弧線C1:f(x,y)=0對于點(diǎn)(a,b)的對稱弧線C2方程為:f(2a-x,2b-y)=0;