已知函数f(x)=sin2x+根号3cos2x,x∈[-π/4,π/4]的最小值?

问题描述:

已知函数f(x)=sin2x+根号3cos2x,x∈[-π/4,π/4]的最小值?

f(x)=√[1^2+(√3)^2]·sin(2x+arctan√3/1)
=2sin(2x+π/3),x∈[-π/4,π/4]
∴易得f(x)min=f(-π/4)=-1