增区间.则:2kπ-π/2≤2x-π/3≤2kπ+π/2,解得kπ-π/12≤x≤kπ+5π/12,则增区间是[kπ-π/12,kπ+5π/12],其中k是整数;
同样地,求减区间就是解2kπ+π/2≤2x-π/3≤2kπ+3π/2,得:[kπ+5π/12,kπ+11π/12].
增区间.则:2kπ-π/2≤2x-π/3≤2kπ+π/2,解得kπ-π/12≤x≤kπ+5π/12,则增区间是[kπ-π/12,kπ+5π/12],其中k是整数;
同样地,求减区间就是解2kπ+π/2≤2x-π/3≤2kπ+3π/2,得:[kπ+5π/12,kπ+11π/12].