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1.本单元知识点三角函数是数学中常见的一类关于角度的函数,是属于初等函数中的超越函数的一类函数,它们的本质是任何角的集合与一个比值的集合的变量之间的映射.三角函数将直角三角形的内角和它的两个边的比值相关联,也可以等价地用与单位圆有关的各种线段的长度来定义.三角函数在研究三角形和圆等几何形状的性质时有重要作用,也是研究周期性现象的基础数学工具.
The knowledge of this unit trigonometric functions are a class of functions that are common to mathematics in terms of angle and belong to transcendental functions in elementary functions whose essence is between any set of angles and a set of ratios The trigonometric functions associate the interior angle of a right-angled triangle with the ratio of its two sides, and can also be equivalently defined by the length of the various line segments associated with the unit circle. Trigonometric Functions When studying the geometry of triangles and circles The nature of the time has an important role, but also the basic mathematical tools to study the cyclical phenomenon.