cos(π/6-x)=cosπ/6cosx+sinπ/6sinx=√3cosx/2+sinx/2
cos(π/6+x)=cosπ/6cosx-sinπ/6sinx=√3cosx/2-sinx/2
cos(π/6+x)+cos(π/6-x)
=√3cosx
化简cos(π/6+x)+cos(π/6-x)
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