f(x)=根号下3sinwx+cos(wx+π/3)+cos(wx-π/3)
=根号下3sinwx+coswxcosπ/3-sinwcsinπ/3+coswxcosπ/3+sinwxsinπ/3
=根号下3sinwx+2coswxcosπ/3
= 根号下3sinwx+coswx
=2sin(wx+π/6)
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f（x）＝√3sin wx +cos（wx+蟺/3）+cos（wx－蟺/3）,x∈R,
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