23.(2023春•长宁区校级期中)函数y=tan(2x−π4)y=\tan (2x-\frac{\pi }{4})y=tan(2x−4π)的单调递增区间为___(kπ2−π8(\frac{k\pi }{2}-\frac{\pi }{8}(2kπ−8π[,]kπ2+3π8)\frac{k\pi }{2}+\frac{3\pi }{8})2kπ+83π)[,]k∈Zk\in Zk∈Z___.