函数y=sin(π/4-2x)的单调递减区间,

函数y=sin(π/4-2x)的单调递减区间,

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
kπ-π/2≤2x-π/4≤kπ+π/2
kπ/2-π/8≤x≤kπ/2+3π/8 k∈z