Can I do this?

So if I analyse an opening with the computer/database and it accours in a daily game can i use those notes?

I would say no.

"No chess programs or engines (e.g. Chessmaster, Fritz, Komodo, Houdini, Stockfish, Chessbase with any active UCI engine, etc.) can be used to analyze positions in ongoing games at any time."  

Says the Fair play rules. Well in this case I wouldn't use the computer while the game is ongoing. I would analyse some potential moves, but it's possible that my opponent plays something else.

"You may not consult an engine, or another human, to provide an opinion on the opening database, tablebases, self-preparation or analysis that would relate to a particular game-in-progress on Chess.com. "

Here it also says that you can't get opinion on an ongoing-game (from computers/humans).  But If you make notes with engine/database before the game (thinking that the opponent can play something else) would that count as cheating?

Notes in general would be fine but you shouldn't include any numerical evaluations for positions. You also probably wouldn't want to try and generate a move tree of top engine moves either 

So if I write in my notes for example: Black is better ∓, but I don't write numerical evaluation, than that doesn't count cheating, right?

Oh my, how is it possible?

What?

To use books

Ongoing daily games are public on our profiles. So if someone, unprompted, suggests I play a specific move in one of my dailies, or comments on the position, I hope that doesn't count as "consulting other people".