What is the period of f(x)=sin(x)cos(3x)+cos(x)sin(3x)f(x) = \sin(x) \cos(3x) + \cos(x) \sin(3x)f(x)=sin(x)cos(3x)+cos(x)sin(3x)?
π/2\pi/2π/2
π\piπ
2π/32\pi/32π/3
2π2\pi2π