作业帮sinx+cos(x+π/3)化简为什么sinx+cosxcos(π/3)-sinxsin(π/3) =sin(x-π/3)
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/11 03:12:05
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sinx+cos(x+π/3)化简为什么sinx+cosxcos(π/3)-sinxsin(π/3) =sin(x-π/3)
sinx+cos(x+π/3)化简
为什么sinx+cosxcos(π/3)-sinxsin(π/3)
=sin(x-π/3)
sinx+cos(x+π/3)化简为什么sinx+cosxcos(π/3)-sinxsin(π/3) =sin(x-π/3)
童鞋,你写的sinx+cosxcos(π/3)-sinxsin(π/3)=sin(x-π/3)是不对的!
如果把x=0带入,左边和右边根本不等啊!
不做三角函数很多年,做的不一定对啊：
如果你学了和差化积,那就直接用和差化积：