在平时学习及高考中经常碰到已知sinα+cosα的值,求相关的一些问题,若要能准确求出问题的结果,找准角所在范围是很必要的.下面根据自己在教学中的经验,以sinα+cosα为例谈如何找出角的范围的其中的一种方法.我们将角放在单位圆中进行分析,由正弦线余弦线的性质有 In the usual learning and college entrance examination often encountered known sin α + cos α value, and seek some related issues, to be able to accurately find the results of the problem, find the scope of the scope of the angle is necessary. The following according to their own teaching Experience, sin α + cos α as an example of how to find out the scope of the angle of the angle.We put the angle of the unit circle for analysis by the nature of the sine line cosine