求正弦函数的单调区间的时候,你可能遇到过不会思考问题,或者不知怎样求单调区间的方法而着急的现象,此文教会你求单调区间的一种方法——化归法.1.化归法的应用例1求函数f(x)=sin(1/2x+π/3)在[-2π,2π]上的递增区间.分析问题因为求熟悉函数的递增区间容易,所以,我们把不熟悉函数转换为熟悉函数,此后,先求熟悉函数的递增区间,再求不熟 When seeking a monotonous range of sine functions, you may encounter problems that do not think about the problem or are anxious about how to find a monotonous range. Example 1 of the normalization method Seeks the increasing range of the function f (x) = sin (1 / 2x + π / 3) on [-2π, 2π] Analysis Problem Because it is easy to find the increment range of the familiar function, We are not familiar with the function converted to a familiar function, then, first seek the incremental range of familiar functions, and then ask unfamiliar