已知向量m=(sin2x,2cosx),n=(根号3,cosx) 函数f(x)=m*n-1

1
向量m=(sin2x,2cosx),n=(根号3,cosx)
f(x)=m*n-1=√3sin2x+2cos²x-1
=√3sin2x+cos2x
=2(√3/2sin2x+1/2cos2x)
=2sin(2x+π/6)
f(x)最小正周期T=2π/2=π
2
∵f(A)=1
∴2sin(2A+π/6)=1
∴sin(2A+π/6）=1/2
∵0