任意角的三角函数定义,是三角函数的最基本的概念;对于高一新生来讲,该定义中的纵坐标y和因变量y容易混淆,进而导致三角函数部分的基础不扎实,甚至影响其学习数学的信心,我认为用y_(函数值)=sinx_(角)=y_(纵坐标)/r等公式能解决这个问题;教材中任意角的三角函数的定义,其学习目标模糊而不明确,我认为应该直接确定为“求三角函数值y”;其应用有:求函数值,正弦型函数,参数方程,其它方面等四个方面,可以进一步 The trigonometric function definition of arbitrary angle is the most basic concept of trigonometric function. For the freshman, the y coordinate y and the dependent variable y are easy to be confused, which leads to the foundation of the trigonometric function is not solid or even affect To learn the confidence of math, I think this problem can be solved by using the formula of y_ (function value) = sinx_ (angle) = y_ (ordinate) / r. The definition of the trigonometric function of any angle in the textbook is ambiguous , I think it should be directly determined as “seeking trigonometric function value y ”; its applications are: find the value of the function, the sine function, the parametric equation, and other aspects of the four aspects can be further