sin(2x-π/3)的单调区间是-π/2+2kπ≤2x-π/3≤π/2+2kπ
然后变成-π/2+2kπ+π/3≤2x≤π/2+2kπ +π/3
-π/4+kπ+π/6≤x≤π/4+kπ +π/6即-π/12+kπ≤x≤5π/12+kπ
sin(x/2-π/3)的单调区间是-π/2+2kπ≤x/2-π/3≤π/2+2kπ
-π/2+2kπ+π/3≤x/2≤π/2+2kπ +π/3
-π+4kπ+2π/3≤x≤π+4kπ +2π/3
其中的4kπ不可以改变
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