Which of the following functions have a period of π\piπ?
f(x)=sin(2x)f(x) = \sin(2x)f(x)=sin(2x)
f(x)=tan(x)f(x) = \tan(x)f(x)=tan(x)
f(x)=cos2(x)f(x) = \cos^2(x)f(x)=cos2(x)
f(x)=sin(x)f(x) = \sin(x)f(x)=sin(x)