Since I did not remember the command to do a derivative, I was trying with
a very simple formula. Since I did not find the right command on my own, I
looked at [SageMath guide](http://www.sagemath.org/calctut/derivative.html)
and then I tried to run the following command
derivative(5x, x)
>
but it returns error
Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "_sage_input_22.py", line 10, in <module>
> exec compile(u'open("___code___.py","w").write("# -*- coding:
> utf-8 -*-\\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("ZGVyaXZhdGl2ZSg1eCwgeCk="),globals())+"\\n");
>
> execfile(os.path.abspath("___code___.py"))
> File "", line 1, in <module>
>
> File "/tmp/tmpZWBMYQ/___code___.py", line 2
> derivative(5x, x)
> ^
> SyntaxError: invalid syntax
>
Instead the command from the guide
derivative(x^2, x)
>
works flawlessly. They seem both equal, but mine does not work. Why?
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