对楼上作出修改仔颂洞念枯
sina-√3(cosa)
=2[(1/2)sina - (√3/樱穗2)cosa]
=2sin(a-π/3)
∴(2m-3)/(2-m)=2sin(a-π/3)∈[-2,2]
即-2≤(2m-3)/(2-m)≤2
∴7/4≤m<2
sina-√3(cosa)
=2[(1/裂兄2)sina - (√3/2)cosa]
=2sin(a-π/3)
∴(2m-3)/(2-m)=2sin(a-π/3)∈[-1,1]
即-1≤(2m-3)/(2-m)≤并源竖1
∴1≤m≤5/绝大3