cos(x-派\6)=-根号3\3,则cosx+cos(x-派\3)=

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$cos(x-派\6)=-根号3\3,则cosx+cos(x-派\3)=$

cos(x-派\6)=-根号3\3,则cosx+cos(x-派\3)=
cos(x-派\6)=-根号3\3,则cosx+cos(x-派\3)=