利用《高等几何》的观点、方法解决《解析几何》中的二次曲线的切线的存在性与求法问题。
To solve the problem about determinant and solution to tangent line of curve of second order in Analytic Geometry with viewpoint and methods of Higher Geometry.
通过骨架对裂缝二次采样，沿骨架点切线方向的垂线方向求出相应的宽度。
The crack is re-sampled by the skeleton and calculate via vertical direction of the tangent direction of the point on skeleton.
平面解析几何对“求过二次曲线外的点所引曲线切线的方程”的问题，未给出一般的方法和公式。
The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
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