That is "not a crack". That is cracked and sunken concrete. Top coating will not be a viable solution. If you were to remove the "triangular" sunken area and replaced it somewhat on the same level as the area outside the triangular sunken area you will have about 20+ bags 60 lb. of concrete to mix and that is a lot. If the sunken part is thicker than 4 inches you just add more and more concrete mix and more and more labor. You need to decide to spend money on a patch that will always look like a patch or go all the way, which can be costly.