函数y=4sin(wx +π/4)cos(wx-π/4)-2sin(wx-π/4)cos(wx+π/4)(w>0)化简

其他人气：990 ℃时间：2019-11-06 09:26:21

优质解答

y=2sin(wx+π/4)cos(wx-π/4)-2cos(wx+π/4)sin(wx-π/4)+2sin(wx+π/4)cos(wx-π/4)=2sin[(wx+π/4)-(wx-π/4)]+2sin(wx+π/2-π/4)cos(wx-π/4)=2sin(π/2)+2cos²(wx-π/4)=2+2cos²(wx-π/4)=3+2cos...

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