/sci/ - Science & Math

>>16103462
watch this
https://www.youtube.com/watch?v=60z_hpEAtD8
and ignore the stupidity of anything involving cross products (start at 13:41 or 14:36)

TL;DW: write each vector as a sum of their basis vectors, and simply multiply them using the distributive property. The dot product, "cross product", and any other higher dimensional product relations fall out naturally

Also, cross products are essentially rotations, so by definition they can only be 2D