COSx的单含弯增谈好闷区间是【2kπ-π/2,2kπ】则2kπ-π/2<2x-π/4<2kπ
得kπ-π/8
函数y=cos（2x-π/4）的单调增区间
COSx的单含弯增谈好闷区间是【2kπ-π/2,2kπ】则2kπ-π/2<2x-π/4<2kπ
得kπ-π/8
COSx的单含弯增谈好闷区间是【2kπ-π/2,2kπ】则2kπ-π/2<2x-π/4<2kπ
得kπ-π/8
COSx的单含弯增谈好闷区间是【2kπ-π/2,2kπ】则2kπ-π/2<2x-π/4<2kπ
得kπ-π/8
COSx的单含弯增谈好闷区间是【2kπ-π/2,2kπ】则2kπ-π/2<2x-π/4<2kπ
得kπ-π/8