增区间是：2kπ－π/2≤2x＋π/3≤2kπ＋π/2即：kπ－5π/12≤x≤kπ＋π/12增区间是：[kπ－5π/12，kπ＋π/12]，k∈Z
-π/2+2kπ≤2x+π/3≤π/2+2kπ解得-5π/12+kπ≤x≤π/12+kπ;k∈Z
-5π/12+kπ≤x≤π/12+kπ，k属于正整数
