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对圆锥曲线C上存在两点P,Q关于直线l对称,求参数的取值范围问题,可先求出以PQ为直径的圆的方程,再利用Δ=D~2+ E~2-4F>0并注意到圆心在直线l上这一隐
There are two points P on the conic curve C, and Q is symmetric about the line l. To find the range of the parameters, you can first find the equation for the circle with PQ as the diameter, and then use Δ=D~2+ E~2-4F. > 0 and notice the center of the circle on line l