（2）y=cos（TT/4-2x）的单调减区间
2kπ<=TT/4-2x<=2kπ+π
即得,单调减区间:
-kπ-3π/8<=x<=-kπ+π/8
（3）y=tan（2x-TT/3）的单调区间
2kπ-π/2<=2x-TT/3<=2kπ+π/2
即得,单调增区间:
kπ-π/12<=x<=kπ+5π/12y=2sin（TT/3-x）的单调增区间2kπ-π/2<=TT/3-x<=2kπ+π/2y=2sin（TT/3-x）的单调增区间-2kπ-π/6<=x<=-2kπ+5π/62kπ+π/2<=TT/3-x<=2kπ+3π/2y=2sin（TT/3-x）的单调减区间-2kπ-7π/6<=x<=-2kπ-π/6以上k∈Z