Thanks. Hopefully some of the math will start coming back as I go
through this. I'm glad I didn't spend an hour looking for the
'conversion'.
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Sorry but I've spent over an hour on google and not found this. I've
had calculus but haven't used it in years. I decided to do some
brushing up and learn sage at the same time.
I have the number -0.6167. If I want degree representation on my old
HP48 I use acos and get 128(degrees) In sage