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:2024/08/02 22:27:01
数学三角函数求值
![](http://img.wesiedu.com/upload/a/2e/a2e60704a05932517751683fce0443f0.jpg)
请稍后 再答: 答: 2sin20°+cos10°+tan20°sin10° =2sin20°+(cos20°cos10°+sin20°sin10°)/cos20° =2sin20°+cos(20°-10°)/cos20° =2sin20°+cos10°/cos20° =(2sin20°cos20°+sin80°)/cos20° =(sin40°+sin80°)/cos20° =2sin60°cos20°/cos20° =√3