三角函数范围问题是高考中的热点问题,也是困扰同学们学习的一个难点问题.本文就三角函数中典型的范围易错题加以评析,并给出相应的解题对策,以期达到窥一斑而知全豹的功能.一、三角函数值对角范围的隐限制角终边的唯一性决定了角的某一三角函数值是唯一的,但角的某一三角函数值对应角大小因有终边相同形式或终边的对称 The range of trigonometric functions is a hot issue in the college entrance examination, and it is also a difficult problem that confuses the students to learn. This paper analyzes the typical range of error-prone problems in trigonometric functions, and presents corresponding solutions to the problem. The functions of the full leopard. First, the implicit limit of the trigonometric function value diagonal range The uniqueness of the terminal edge determines that a certain trigonometric function value of the angle is unique, but the value of a certain trigonometric function of the corner corresponds to the size of the terminal. Formal or terminal symmetry