设函数f(x)=根号3sin2x+2cos^2x+2,求F(x)的最小正周期和值域

因为f(x)=√3sin2x+2(cosx)²+2
=√3sin2x+1+cos2x+2
=2(√3/2 * sin2x + ½ * cos2x)+3
=2(cosπ/6 * sin2x + sinπ/6 * cos2x)+3
=2sin(2x+π/6)+3
所以f(x)的最小正周期为2π/2=π
因为f(x)|max=2+3=5,f(x)|min=-2+3=1,
所以f(x)的值域为[1,5]