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三角函数是基本初等函数之一,它是描述周期现象的重要数学模型.学习三角函数及其基本性质,可以加深对函数的概念与性质的理解,体会三角函数在解决具有周期变化规律的问题中的作用.
The trigonometric function is one of the elementary elementary functions. It is an important mathematical model to describe the periodic phenomenon. Learning the trigonometric function and its basic properties can deepen the understanding of the concept and nature of the function and realize that the trigonometric function can solve the problem of periodical variation. The effect of.