Taking notes with MBA (Math Classes)

Hi!

I'm a Math student and I really wanted to take the most out of my MBA and don't use paper at all in my classes.

But I have big problems doing that because we use a a lot symbols and greek letters. I searched for taking notes apps and I got SimpleNote and Notational Velocity. They are great to write on but when it comes to math they don't do the work I want.

I would like to know if you have suggestions about software that can work with math symbols and it's easy to use and keep up with class.