cos(α +2π/3)=1/6,则cos(2α-2π/3)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 02:46:14
![cos(α +2π/3)=1/6,则cos(2α-2π/3)](/uploads/image/z/6844127-23-7.jpg?t=cos%28%CE%B1+%2B2%CF%80%2F3%29%3D1%2F6%2C%E5%88%99cos%282%CE%B1-2%CF%80%2F3%29)
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(a-π/3)=cos(a+2π/3-π)=√35/36 原式=cos【2(a-π/3)]=35/18-1=17/18
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 02:46:14
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(α +2π/3)=1/6,则cos(2α-2π/3)
cos(a-π/3)=cos(a+2π/3-π)=√35/36 原式=cos【2(a-π/3)]=35/18-1=17/18