sin(π/3-2x)=sin(-2x+π/3)x的系数是-2复合函数,内部是减函数∴需要外部sin的增区间,整体函数才是减函数∴令-π/2+2kπ≤-2x+π/3≤π/2+2kπ,k∈Z-5π/6+2kπ≤-2x≤π/6+2kπ,k∈Z-π/12-kπ≤x≤5π/12-kπ,k∈Z...