cos2x-1/2〉0且9-x^2〉=0
对于 cos2x-1/2〉0
0+2kπ
函数y=lg(cos2x-1/2)-根号(9-x^2)的定义域?
函数y=lg(cos2x-1/2)-根号(9-x^2)的定义域?
RT
RT
数学人气:770 ℃时间:2019-10-24 07:57:16
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