∵y＝sin(wx-π/3).cos(wx-π/3)y=(1/2)×[2sin(wx-π/3).cos(wx-π/3)]
∴y=(1/2)sin(2wt-2π/3)
∵T=2
∴2W=2π/T=2π/2=π
∴W=π/2
反思：小心2w与w的区别.