求三角函数的最值(值域)是近几年高考的热点之一．解决这类问题不仅需要用到三角函数的定义域、值域、单调性、图像和三角函数的恒等变形,而且还常涉及到函数、不等式、方程、几何等众多知识,其概念性强,具有一定的综合性和灵活性．下面谈谈这方面的题型: Finding the trigonometric value (value range) is one of the hot topics in the college entrance examination in recent years. Solving such problems not only requires the use of the trigonometric function’s definition domain, value domain, monotonicity, constant deformation of images and trigonometric functions, but also often involves functions such as functions, inequalities, equations, and geometry. Its concept is strong. Has a certain degree of comprehensiveness and flexibility. Let us talk about this type of question: