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普通高中课程标准实验教科书《数学》选修4-4中有这样一道习题:求证:等轴双曲线上任意一点到两渐近线的距离之积是常数.事实上,一般的双曲线也具有这一性质.例1求证:双曲线上任意一点到两渐近线的距离之积是常数.
The general high school curriculum standard experimental textbook “Mathematics” elective 4-4 there is such a problem: Proof: any point on the equiaxial hyperbola to the distance between the two asymptotes is a constant product. In fact, the general hyperbolic also has this A nature of. Example 1 Verify: hyperbolic point to the distance between the two asymptotes is a constant product.