三角函数是一类有别于一般函数的初等超越函数,它反映的是“角”与“边(的比)”的关系.三角函数作为一种函数载体,变量的认识是最为关键的基本问题.下面结合自己的教学实践谈点体会.一、变量的统一性在数学中,三角函数是“角”的函数.它们在研究三角形 A trigonometric function is a type of elementary transcendental function that is different from a general function. It reflects the relationship between the “angle” and the “side ratio”. The trigonometric function is a kind of function vector, and the variable’s knowledge is the most important. The key basic questions. The following discussion of the teaching experience in conjunction with their own experience. First, the unity of variables In mathematics, the trigonometric function is a function of the “angle”. They are studying the triangle