化简cosx-根号3cos(30°+x)+cos(x+60°)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 07:01:01
![化简cosx-根号3cos(30°+x)+cos(x+60°)](/uploads/image/z/638168-32-8.jpg?t=%E5%8C%96%E7%AE%80cosx-%E6%A0%B9%E5%8F%B73cos%2830%C2%B0%2Bx%29%2Bcos%28x%2B60%C2%B0%29)
化简cosx-根号3cos(30°+x)+cos(x+60°)
化简cosx-根号3cos(30°+x)+cos(x+60°)
化简cosx-根号3cos(30°+x)+cos(x+60°)
原式
=cosx-根号3 cos30cosx+根号3sin30sinx+cosxcos60-sinxsin60
=cosx-3/2cosx+根号3 /2 sinx +1/2 cosx-根号3/2 sinx
=0