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单位圆是数学中研究问题与解决问题的一个重要工具。通过单位圆所表示的三角函数线段能将比较抽象的三角函数量,表示成形象的有向线段,从而能将非几何的问题转化成几何问题来解决。本文拟就单位圆在三角不等式中的应用谈谈几点想法. 一、用单位圆解三角不等式某些三角不等式,利用单位圆来解,比较形象直观,并且可以加深学生对三角函数定义和性质的理解、
The unit circle is an important tool for studying problems and solving problems in mathematics. The trigonometric line segment represented by the unit circle can represent the relatively abstract trigonometric function as a directed line segment of the image, so that the problem of non-geometry can be converted into a geometric problem. This article plans to talk about the application of the unit circle in the triangle inequality. First, use the unit circle to solve some triangle inequalities, use the unit circle to solve, compare the image intuitive, and can deepen students’ definition and nature of trigonometric functions. Understanding,