已知函数f(x)=cos(2x-π/3)+2sin

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f(x)＝cos(2x-π/3)+2sin(x-π/4)sin（x+π/4）＝cos(2x－π/3)＋2sin(x－π/4)cos[π/2－(x＋π/4)]＝cos(2x－π/3)＋2sin(x－π/4)cos(x－π/4)＝cos(2x－π/3)＋sin(2x－π/2)＝cos(2x－π/3)＋cos2x＝2cos(2x－...

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