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三角函数是基本初等函数之一,是描述客观世界周期性变化规律的重要数学模型.通过对三角函数的学习,能进一步加深对函数的理解;通过对三角恒等变形的学习,能体会问题表现形式的多样性与统一性;通过对解三角形的学习,能深化对“普遍联系”的认识.而正弦函数、余弦函数的图象是学习三角函数图象与性质的入门课,是三角函数的核心内容之一,其重要性不言而喻.图象法作为研究函数的一种常用方法,是从
The trigonometric function is one of the elementary elementary functions. It is an important mathematical model that describes the periodical regularity of the objective world. Through the study of trigonometric functions, it can further deepen the understanding of the function. By learning the trigonometric constant deformation, we can understand the performance of the problem. The diversity and unity of the forms; the understanding of the “general connection” can be deepened through the study of solving triangles. The images of the sine function and cosine function are the introductory lessons of learning the image and nature of the trigonometric functions. The importance of one of the core contents of the function is self-evident. The image method as a common method for studying functions is from