y = sin(π/3 - 2x) + cos2x= sin(π/3)cos2x - cos(π/3)sin2x + cos2x= (sin(π/3) + 1)cos2x - cos(π/3)sin2x = acos2x - bsin2x (a,b为两个常数)= c * ( a/c*cos2x - b/c*sin2x )(c = (a+b)^0.5)= c*sin(2x + d...