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三角函数的最值是对三角函数的概念、图像与性质以及对诱导公式,同角间基本关系式,两角和与差三角函数公式的综合考查,也是函数思想的具体体现。求三角函数的最值问题可通过适当的三角变换或代数换元,化归为以下各类的三角函数或代数函数,再利用三角函数的有界性或常用的求函数最值的方法去处理,通常有下面这些类型。
The maximum value of the trigonometric function is a comprehensive examination of the concept, image and properties of the trigonometric function, as well as a comprehensive examination of the induction formula, the basic relation between the same angle, the two corners and the difference trigonometric function formula, which is also a concrete manifestation of the function thought. Find the maximum value of the trigonometric function can be reduced to the following types of trigonometric or algebraic functions by appropriate trigonometric or algebraic substitutions and then use the boundedness of the trigonometric functions or the usual way of finding the most significant value of the function , Usually the following types.