Which of these is a property of the dot product?
u⋅v=v⋅uu \cdot v = v \cdot uu⋅v=v⋅u
u⋅(v+w)=u⋅v+u⋅wu \cdot (v + w) = u \cdot v + u \cdot wu⋅(v+w)=u⋅v+u⋅w
u⋅u=∣∣u∣∣2u \cdot u = ||u||^2u⋅u=∣∣u∣∣2
u⋅vu \cdot vu⋅v is a vector