三角函数最值问题是三角函数基础知识的综合应用.解这类题,不仅用到三角中的各种知识,而且涉及到求最值的诸多方法,因而成为高考命题的热点.同学们在求解中一要注意三角函数的变形方向,二要注意正、余弦的有界性,还要注意灵活选择解题方法.本文就常见的一些三角函数最值问题,分类解析如下. The most important issue of trigonometric functions is the comprehensive application of the basic knowledge of trigonometric functions .This kind of question not only uses all kinds of knowledge in trigonometry, but also involves many ways to find the most value, thus becomes the hot topic of college entrance examination proposition. In the first, we should pay attention to the deformation direction of the trigonometric function, we should pay attention to the boundedness of cosine and cosine, and we should pay attention to the method of choosing the solution flexibly.This paper analyzes the most common problems of trigonometric functions, classified as follows.