To all, I've known for a long time that the 83's have had the i variable built into them, and in fact, they also give you an answer like 3+2i.. Now my question is, why doesn't the 86? Are there any good BASIC or Assem programs which simulate the type of behavior found on the 83? This would help a lot of us out who are still in Pre-Calc / Trig.. Thanks, Luke