fx=(sin4x)/2sin(4x+2π)=sin(4(x+π/2))=sin4x所以周期是π/4sin4x=-sin-4x 所以是奇函数所以是D
f(x)=sin2xcos2x=1/2*sin4x所以T=2π/4=π/2f(-x)=-1/2*sin4x=-f(x)所以是奇函数选D
f(x)=sin2x·cos2x=1/4sin4x所以选D