At 32:00, the prove is just the component e and p equal to b. But I think the e should be perpendicular to the line, not to take the y components... i.e. at 32:00, for the proof, there is an assumption that the x component of b,e,p are the same.Anyway, it is a great video series for review. :>####[['e', 'Mathematical_Related_Concept', 'NEG'], ['video series', 'Course_General_Feedback', 'POS']]