Pretty good professor. My course was entirely based on worksheets, so it didn't really matter who the teacher was. Prof Dizaji was very kind in helping me in out in class and office hours, so kudos to him for that. He did assign way too many worksheets to fill out though.

Prof.Shafiei is a great teacher, but seems kind of aggressive in his teaching style. However, if you really try to pay attention, his lectures are very informative. Definitely go to his office hours if you end up taking it with him, they are really helpful especially for written homeworks. I don't really recommend differential equations as a class unless you are required to take it, because the time commitment is way too rigorous for a 4 credit class; there are written homeworks, webworks, pre-class/in-class, and videos — keeping up with all of that will feel like a part time job.