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有关三角函数的单调区间的确定或比较三角函数值的大小等问题,一般先将函数化成基本三角函数的形式,借助于单位圆或三角函数的图像来处理,数形结合思想是处理三角函数有关问题的重要方法.
For the determination of the monotonous intervals of trigonometric functions or the comparison of the sizes of the trigonometric functions, the functions are usually first transformed into the form of basic trigonometric functions, which are processed by means of images of unit circles or trigonometric functions. The important method of the problem.