Essentially you require the coordinate of every vector to become 0. I sort of kind of disagree with zero. Cross merchandise of vectors By Endar December 22 2004 at Physics and Math This subject is 5411 days old that is more compared to the day brink we permit for answers. Section 5-4 Cross Product. In this last part of the chapter we’ll examine the cross product of 2 vectors. We should mention that the product demands the vectors both to be three vectors.