f（x）=(√3/2)sin2x-(1/2)(1+cos2x)-(1/2)=(√3/2)sin2x-(1/2)cos2x=sin2xcox(π/6) - cos2xsin(π/6) =sin(2x - π/6)∵ x∈[-π/12,5π/12]∴ 2x - π/6 ∈ [-π/3,2π/3]令 2x - π/6 =t,则f(x) = sint ,t∈ [-...