函数y=sin(π/4-2x)的单调递减区间y=sin(π/4-2x)=sin[-(2x-π/4)]=-sin(2x-π/4)要求y的单调递减区间,只需要求sin(2x-π/4)的单调递增区间即可2kπ-π/2≤2x-π/4≤2kπ+π/2kπ-π/8≤x≤kπ+3π/8 k∈z同样要求y...