16. [-/5 Points] DETAILS LARCALC12 11.3.072. Consider the vectors u = (cos(a), sin(a), 0) and v = (cos(B), sin(B), 0), where a > B. Find the dot product of the vectors. U . V = Use the result to prove the identity cos(a - B) = cos(a) cos(B) + sin(a) sin(B). The angle between u and v is Taking the cosine of this angle we have the following. U . V COS U . V S