∵sinx-1/2≥0,2cosx-1≥0
∴sinx≥1/2,cosx≥1/2
2kπ+π/6≤x≤2kπ+5π/6,2kπ-π/3≤x≤2kπ+π/3
∴2kπ+π/6≤x≤2kπ+π/3
定义域:{x|2kπ+π/6≤x≤2kπ+π/3 (k∈Z)}