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文[1]给出了椭圆两弦端点处的切线的两个优美性质,笔者类似此法,发现抛物线两条弦端点处的切线也存在着类似的性质.
In [1], two elegant properties of the tangents at the ends of the two ellipses of the ellipse are given. Similar to this method, the author finds that the tangents at the ends of the two chords of the parabola have similar properties.