函数f(x)=根号3(sinx的平方-cosx的平方)-2sinxcosx=-根号3cos2x-sin2x=-2 (根号3/2cos2x+1/2sin2x)=-2(sinπ/3cos2x+cosπ/3sin2x)=-2sin(2x+π/3)最小正周期=2π/2=π当2kπ+π/2≤2x+π/3≤2kπ+3π/2时递增即 2kπ+π/6≤2x≤2kπ+7π/6kπ+π/12≤x≤kπ+7π/12, k∈Z即增区间为[kπ+π/12,kπ+7π/12],k∈Z