fig, (ax1,ax2) = plt.subplots(2,sharex=True)
def animate(t):
    x = np.linspace(0,1)
    ax1.clear()
    ax1.plot(x,np.cos(x-t))
    ax2.clear()
    ax2.plot(x,np.cos(x-2*t))

ani = animation.FuncAnimation(fig,animate,np.linspace(0,1),interval=50)
#ani.save("test.mp4")
plt.show()