化为 y= - sin(3x/2-π/4),
由题,π/2+2kπ≤3x/2-π/4≤3π/2+2kπ,
3π/4+2kπ≤3x/2≤7π/4+2kπ,
π/2+4kπ/3≤x≤7π/6+4kπ/3,k属于Z
递增区间是 [π/2+4kπ/3,7π/6+4kπ/3],