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三角函数的学习是对函数概念的深化,在高中数学必修一中学习了函数的基本概念,以及指数函数、对数函数等,与这些函数比较,三角函数是刻画现实世界中存在的某些周期性变化现象的数学模型。所以,要让学生通过学习,掌握三角函数及其基本性质,体会三角函数在解决具体周期性变化规律问题中的作用。一、利用数学发展史引出三角函数三角形诞生的很早,当时的用途就是观测天文。那个时候的人们
Learning trigonometry is the deepening of the concept of function, learning the basic concepts of function in the compulsory maths of high school, as well as the exponential function, logarithmic function, etc. Compared with these functions, the trigonometric function is to describe the existence of certain cycles in the real world Mathematical model of the phenomenon of sexual change. Therefore, to enable students to master the trigonometric functions and their basic properties by learning, understand the role of trigonometric functions in solving the problem of specific periodic changes. First, the history of mathematics leads to the birth of triangular trigonometry was very early, when the use is to observe astronomy. People at that time