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圆上一点的切线方程是课本中一个常见的结论,逆向思维探究直线与圆相切时切点的坐标,以及直线与圆锥曲线相切时切点的坐标,并给出一些简单的应用.
The circular tangential equation is a common conclusion in textbooks. Reverse thinking explores the coordinates of the tangent point when the straight line is tangent to the circle and the coordinates of the tangent point when the tangent of the straight line and the conic curve are tangent, and gives some simple applications.