1. The problem statement, all variables and given/known data Show that B|A|+A|B| and A|B|-B|A| are orthogonal. 2. Relevant equations N/A 3. The attempt at a solution I'm not too sure exactly how to start this. I do know that for two things to be orthogonal, the dot product has to be equal to 0, but I'm not sure how to evaluate this at all.