f(x)=向量OA×向量OB+m=2sin^2x-2√3sinxcosx+1+m=1-cos2x-√3sin2x+1+m=-2sin(2x+π/6)+2+m 1. 单增区间为2x+π/6∈[2kπ+π/2, 2kπ+3π/2],x∈[kπ+π/6, kπ+2π/3]