The second category is the demand curve tangent problem.
第二类问题是求曲线的切线的问题。
The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
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。
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.
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。
From the rolling contact problem of two viscoelastic cylinders with parallel axis, a series of normal-tangent contact coupled integration equation is obtained.
从两个平行轴粘弹性圆柱体的接触问题出发，可以得到一个法向接触和切向接触耦合的积分方程组。
One moment the professor is working hard on a problem in physics, the next he's gone off at a tangent and he's talking about bees.
前一分钟教授还在努力解答一道物理题，下一分钟他就突然开始讲起蜜蜂来。
Heidegger's question about "thing" is tangent the "being" problem.
海德格尔对于物的追问相切于他对整个存在问题的追问。
Heidegger's question about "thing" is tangent the "being" problem.
海德格尔对于物的追问相切于他对整个存在问题的追问。
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