来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/29 00:53:14
如图,一道化简题
![](http://img.wesiedu.com/upload/1/f0/1f04435e869a22d0ae89aee7d7399897.jpg)
求详解
原式=[sin(15-8)+cos15sin8]/[cos(15-8)-sin15sin8]
=(sin15cos8-cos15sin8+cos15sin8)/(cos15cos8+sin15sin8-sin15sin8)
=(sin15cos8)/(cos15cos8)
=sin15/cos15
=(sin15cos15)/(cos15cos15)
=sin30/(1+cos30)
=1/(2+√3)
=2-√3