i think a find out a bug

[santiago gonzalez]

When I was doing my homework at the university, I got a result that I did not expect, checking my code well, I found a bug. It turns out that the script of a function gave me wrong, at first I thought it was wrong, but after doing the derivative by definition I realized that the library gave me the wrong derivative,

I show the screenshot for more details.

the sympy version used is 1.7.1

[Chris Smith]

`ln` and `log` are synonyms for the natural logarithm function:

>>> ln == log

True

>>> log(E),ln(E)

(1, 1)

>>> log(100, 10)

2