How to pre-program formulae and graph equations (not just functions)? Can someone help me??
I don’t know that calculator.
But go to youtube and search for “programming Casio FX-9860 GII.” There HAVE to be videos!
There are, but it’s not what I am searching for! 
MODERATOR’S NOTE:
Closing thread, after editing the clickbait title and moving out of the incorrect subforum. This is not the purpose of this site. Google is your friend, though.