Hello not sure what you mean by not getting the formulas and other things into Onenote? Onenote is a note taking software, I'd say import (download) symbols from the internet which you use and I am sure you will be able to use Onenote as you like.
Additionally, if you have a tablet pc or Smart phone, they have a feature of Ink Notes, meaning you can write things on the screen like you would do on a piece of paper. The tablet then saves those "images (Ink text)" into a note. You can print it, sync it with your pc/mobile and send it via email.
All in all, it all depends how do you use the software.
As far as I am concern I always use One note, infact all my horse riding lesson notes and amounts all are on it. I also use it for my business work