y=SinX×Cos(X-π/3)的值域以及相对应X的值

问题描述:

y=SinX×Cos(X-π/3)的值域以及相对应X的值

y=sinxcos(x-π/3)=sinx[cosxcos(π/3)+sinxsin(π/3)]=sinx[cosx*(1/2)+sinx*(√3/2)]=(1/2)sinxcosx+(√3/2)sin²x=(1/4)sin2x+(√3/2)(1-cos2x)/2=(1/4)sin2x-(√3/4)cos2x+√3/4=(1/2)sin(2x-π/3)+√3/4所...