y=sin(π/6-2x) =-sin(2x-π/6)
增区间即函数 sin(2x-π/6)的减区间
2x-π/6∈[2kπ+π/2,2kπ+3π/2]
x∈[kπ+π/3,kπ+5π/6]
单调增区间为
[kπ+π/3,kπ+5π/6]k的取值范围呢？k去整数k∈Z哦。、。谢。不客气啊