Get-5π/4+2kπ
Therefore, the increasing interval of the function is [-5π/4+2kπ, -π/4+2kπ], k ∈ z.
(2)y= -sin(2x-π/4),
Through 2kπ-π/2
kπ-π/8 & lt; = x & lt=kπ+3π/8,k∈Z,
Therefore, the decreasing range of the function is [kπ-π/8, kπ+3π/8], k ∈ z.