函数y=根号（cosx+1/2）+根号（tanx-1）的定义域为的过程

cosx+1/2≥0cosx≥-1/2（2k-1）π+π/3≤x≤（2k+1）π-π/3tanx-1≥0tanx≥1kπ+π/4≤x＜kπ+π/2 所以（2k-1）π+π/3≤x＜（2k-1）π+π/2 或2kπ+π/4≤x＜2kπ+π/2