f(-x)=-f(x),
f(x)=f[2+(x-2)]=f[2-(x-2)]=f(4-x)=f[-(x-4)]=-f(x-4),
f(x+8)=-f[(x+8)-4]=-f(x+4)=-{-f[(x+4)-4]}=f[(x+4)-4]=f(x),
T = 8.
f(-x)=-f(x),
f(x)=f[2+(x-2)]=f[2-(x-2)]=f(4-x)=f[-(x-4)]=-f(x-4),
f(x+8)=-f[(x+8)-4]=-f(x+4)=-{-f[(x+4)-4]}=f[(x+4)-4]=f(x),
T = 8.