y=1/2sin(π/4-2x/3)求单调区间

问题描述:

y=1/2sin(π/4-2x/3)求单调区间
y=(1/2)sin((π/4)-(2x/3))
y=-|sin(x+(π/4))|

y=1/2sin(π/4-2x/3)=-1/2sin(2x/3-π/4)
单减间区间求法
令2kπ-π/2 =