1. The problem statement, all variables and given/known data "If a vector magnitude 10 is combined with a second vector, the two vectors have a sum with a magnitude of 18 and have a difference with a magnitude of 2√10. Rounded to the nearest hundredth of a degree, what is the measure of the smallest angle between the two vectors? 2. Relevant equations cosθ = (u dotproduct v) / (|u||v|) 3. The attempt at a solution : |u| = 10 : |u+v| = 18 : |u-v| = 2√10 Can you tell me if I'm doing this the right way? If I am, how should I solve this?