1. The problem statement, all variables and given/known data Two vectors A and B have precisely equal magnitudes. For the magnitude of A + B to be 25 times greater than the magnitude of A - B, what must be the angle between A and B? Hint Given: Without loss of generality, you could assume that A and B are unit vectors. Also, the orientation of the vectors is irrelevant, so you're free to assume for example that one vector lies along the x axis, or that they're symmetrically located about an axis. How would you draw triangles to represent the two vector combinations, and how are the angles in these two triangles related? 2. Relevant equations 3. The attempt at a solution I really don't where to start with this one. I set up an isosceles triangle with the two legs as the vectors, but I can't find any angles. I also don't know how to apply the fact that A+B is 25 times A-B.