COS165°三角函数怎么求啊,cos165=cos(180-15)=-cos15=-cos(45-30)=-cos45cos30-sin45sin30=-√2/2*√3/2-√2/2*1/2=-(√6+√2)/4为什么,第二个等号出来的是-cos(45-30)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 04:18:10
![COS165°三角函数怎么求啊,cos165=cos(180-15)=-cos15=-cos(45-30)=-cos45cos30-sin45sin30=-√2/2*√3/2-√2/2*1/2=-(√6+√2)/4为什么,第二个等号出来的是-cos(45-30)](/uploads/image/z/11631250-10-0.jpg?t=COS165%C2%B0%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E6%80%8E%E4%B9%88%E6%B1%82%E5%95%8A%2Ccos165%3Dcos%28180-15%29%3D-cos15%3D-cos%2845-30%29%3D-cos45cos30-sin45sin30%3D-%E2%88%9A2%2F2%2A%E2%88%9A3%2F2-%E2%88%9A2%2F2%2A1%2F2%3D-%28%E2%88%9A6%2B%E2%88%9A2%29%2F4%E4%B8%BA%E4%BB%80%E4%B9%88%2C%E7%AC%AC%E4%BA%8C%E4%B8%AA%E7%AD%89%E5%8F%B7%E5%87%BA%E6%9D%A5%E7%9A%84%E6%98%AF-cos%2845-30%29)
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 04:18:10