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从解析法出发，总结了圆锥与球正交时，其相贯线上的特殊点所处位置的图解规律，提出了求极值点的新方法该方法提高了解题速度和曲线精度
Based on the analytic method, this paper summarizes the graphic law of the position of the special point on the intersecting line when the cone and the ball are orthogonal, and proposes a new method to find the extremum point. This method improves the solution speed and the curve precision