f(x)=sin^2(2x-π/4)= （1-cos(4x-π/2)/2=1/2-（cos(4x-π/2)）/2当2kπ-π≤4x-π/2≤2kπ时,即kπ/2-π/8≤x≤kπ/2+π/8时f(x)单调递减, 当2kπ≤4x-π/2≤2kπ+π时,即kπ/2+π/8≤x≤kπ/2+3π/8时f(x)单调递增