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20180411 12:19:51 0600  asked a question  Nonlinear regression with arbitrary precision arithmetic I'm looking to do something like this: However when I run this a,b and c seem to have been truncated to a double. How would I get arbitrary precision out of find_fit? 
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20151230 18:58:16 0600  asked a question  Expanding cos(a*(x+y)) I'm having trouble finding out how to expand
when wrapped by cos(). The expression
expands as expected, but
, leaves the expression unchanged. I would prefer a solution that scales for more complex expressions 
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20151228 01:59:08 0600  asked a question  Converting expression to list of terms and back Given an expression how would I convert it to a list, and how would I convert a list to an expression? For example:
Would convert to:

20151228 01:59:08 0600  commented question  Trouble building sage from source inside a docker container You mentioned that the above doesn't work. Is there a specific error? 