f(x)=sin(wx+φ)+cos(wx+φ)=√1*2+1*2[√2/2sinwx+φ)+√2/2cos(wx+φ)]=√2[cosπ/4sinwx+φ)+sinπ/4cos(wx+φ)]=√2sin(wx+φ+π/4)
设函数f(x)=sin(wx+φ)+cos(wx+φ)(w>0,|φ|
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