已知cos(x-派/6)=-根号3/3,则cosx+cos(x-派/3)的值是
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 06:08:53
![已知cos(x-派/6)=-根号3/3,则cosx+cos(x-派/3)的值是](/uploads/image/z/5265299-11-9.jpg?t=%E5%B7%B2%E7%9F%A5cos%28x-%E6%B4%BE%2F6%29%3D-%E6%A0%B9%E5%8F%B73%2F3%2C%E5%88%99cosx%2Bcos%28x-%E6%B4%BE%2F3%29%E7%9A%84%E5%80%BC%E6%98%AF)
x){}K5*tm٧oilΧۍuvJUh#5jyڰٌ6IE/`Q[#QDA6Lt ĂJ~OY@Wyx: ըkh_\g J
已知cos(x-派/6)=-根号3/3,则cosx+cos(x-派/3)的值是
已知cos(x-派/6)=-根号3/3,则cosx+cos(x-派/3)的值是
已知cos(x-派/6)=-根号3/3,则cosx+cos(x-派/3)的值是
cosx+cos(x-派/3)
=2cos(2x-π/3)/2cos(x-x+π/3)/2
=2cos(x-π/6)×cosπ/6
=2×(-√3/3)×√3/2
=-1