求值:cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)
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![求值:cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)](/uploads/image/z/15223919-23-9.jpg?t=%E6%B1%82%E5%80%BC%EF%BC%9Acos255%C2%B0%EF%BC%8Bsin%EF%BC%88%EF%BC%8D7%CF%80%2F3%EF%BC%89%EF%BC%8Bcos%EF%BC%88%EF%BC%8D2040%C2%B0%EF%BC%89%EF%BC%8Bsin%EF%BC%88%EF%BC%8D16%CF%80%2F3%EF%BC%89)
求值:cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)
求值:cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)
求值:cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)
cos255°+sin(-7π/3)+cos(-2040°)+sin(-16π/3)=-cos45-sin(π/3)+cos120+sin(2π/3)=-根号(2)/2-根号(3)/2-1/2+根号(3)/2=-(根号(2)+1)/2