Just Another "Sine" That I'm Getting Old

The scientific calculator that I'm using for my current math class is the one I've had since junior high. I went online today to see if I could find the user's guide for it, since I've forgotten how to use some of the functions and it was causing problems for me last night while trying to do my homework on exponents. I don't think it's a good sign that my calculator is in the "Datamath Calculator Museum." Maybe I could sell it to this guy.