f（x）=4sin^2（π/4+x）-2根号3cos2x-1=-(2-4sin^2（π/4+x）+2根号3cos2x+1-2)=-(2cos(π/2-2x)+2根号3cos2x)+1=-(2sin2x+2根号3cos2x)+1=-4(1/2sin2x+根号3/2cos2x)+1=-4(cos60°sin2x+sin60°cos2x)+1=-4sin(2x+...