1. The problem statement, all variables and given/known data 3. The attempt at a solution I am working a physics problem and want to make sure I'm not making a mistake in the math. Here is my math inquiry: Say you have (a*b)(c*d) where * indicates the dot product, and a,b,c, and d are all vectors. Can you say that (a*b)(c*d) = (a*c)(b*d) since the dot product is commutative and gives you a scalar? Thanks!