Hi, I'm creating a derivative tool as an exercise using SymPy. I get this following problem when using it: The tool is based on receiving textual user input and assuming deriving in respect to 'x'. In order to do so, i set x as a symbol and pass it as the second parameter to diff(). When differentiating "e**x" I get: "e**x*log(e)". This answer, while correct, bothers me because I'd like SymPy to know that log(e) == 1.
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