已知函数f(x)=sinx平方+2倍根号3sin(x+派/4)cos(x-派/4)-cosx平方-根号3．

f(x)=(sinx)^2+2√3sin(x+π/4)cos(x-π/4)-(cosx)^2-√3
=-((cosx)^2-(sinx)^2)+√3(sin(x+π/4+x-π/4)+sin(x+π/4-(x-π/4))-√3
=-cos(2x)+√3sin(2x)+√3-√3
=√3sin(2x)-cos(2x)
=2sin(2x-π/6)
(1)
最小正周期：2π/2=π
单调递减区间:2kπ+π/2≤2x-π/6≤2kπ+3π/2
即kπ+π/3≤x≤kπ+5π/6 (k∈n)
(2)
-π/3