On 27/12/2019 09:33, [email protected] wrote:
Strangely enough, I get the following results:
>>> from sympy.abc import *
>>> Derivative(x,y)
Derivative(x, y)
>>> Derivative(x**2,y)
Derivative(x**2, y)
>>> Derivative(x**2,x)
Derivative(x**2, x)
>>> Derivative(sin(x),x)
Derivative(sin(x), x)
>>> simplify(Derivative(sin(x),x))
Derivative(sin(x), x)
>>> simplify(Derivative(sin(x), x))
Derivative(sin(x), x)
>>>
I.e. simplify did not evaluate the derivative at all. That was using
Python 3.7 and sympy 1.5.
I tried this because my guess is that in the OP's original problem, the
variables 's' and 'u' had been accidentally overwritten somewhere
earlier in his sympy session- e.g.
s=0
u=0
Then the derivatives would obviously evaluate to zero.
David
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