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在圆锥曲线部分,散落着很多与圆的相切有关的问题,这些问题的解决对很多同学是个难题,然而细细品味,它们大多隐藏在圆锥曲
In the conic section, there are many problems related to the tangency of the circle. The solution of these problems is a difficult problem for many students. However, they are savored and mostly hidden in the conic