Have you tried the "help" menu? They're usually quite helpful, I find (so long as you can speak gibberish)...
(I had to engrave "Radians!" on the back of my calculator, as when you reset the thing it resets itself to working in radians - and you never usually have to reset it except in exams. By the time you realise all your answers are in radians it's usually too late. *grumbles* Stupid thing)
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