801y=log2016（x^2-ax+65）R+aJR+x^2-ax+651x^2-ax+640a-4640a161616162xy=sinxsin2xy=2sin^2xcosxy^2=4sin^4xcos^2x=2（1-cos^2x）（1-cos^2x）*2cos^2xy439cos^2x=134393258||20154914||2014（）__13445whatsoeasy99100990osp