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文[1]给出了共焦点的圆锥曲线的切线性质,读后很受启发.本文对其进行了推广,并应用导数的相关知识给出证明,这个证明是非常自然也是容易接受的.
The paper [1] gives the tangent property of the confocal cone of conic curve, which is inspired by reading.This paper generalizes it and applies the derivative knowledge to prove it, which is very natural and acceptable.