1.周期=2π÷2=π
2.增区间：
2kπ-π/2≤2x＋π/3≤2kπ+π/2
2kπ-5π/6≤2x≤2kπ+π/6
kπ-5π/12≤x≤kπ+π/12
即增区间为：
【kπ-5π/12,kπ+π/12】,k∈Z