f(x)=2sinx*sin(π/2+x)-2sin^2x+1
=2sinxcosx+1-2sin^2x
=sin2x+cos2x
=√2*sin(2x+π/4)
最小正周期T=2π/2=π
单调递增区间2x+π/4∈[2kπ-π/2,2kπ+π/2]
x∈[kπ-3π/8,kπ+π/8]
对称中心2x+π/4=2kπ+π/2
x=kπ+π/8