y=-sin(x+π/4)的单调递减区间咋算呢?

y=-sin(x+π/4)的单调递减区间咋算呢?
y=-sin(x+π/4)的单调递减区间咋算呢?

y=-sin(x+π/4)的单调递减区间咋算呢?
y=-sin(x+π/4)的单调递减区间
即求y=sin(x+π/4)的单调递增区间
所以 2kπ-π/2≤x+π/4≤2kπ+π/2
2kπ-3π/4≤x≤2kπ+π/4
所以 y=-sin(x+π/4)的单调递减区间【2kπ-3π/4,2kπ+π/4】,k∈Z