Er well, the calculator I had didn't do anything except add, subtract, and multiply. So a graphing calculator would have nice functions like cosine and things

Not to mention I know lots of ways to finagle answers on the calculator (not by cheating by typing stuff in beforehand) if I don't understand how I should be
actually doing it. Like on my math test last year, I forgot how to do the recurring formula, so I made a program on my calculator to do it for me (used a for loop that went on foreeever).