wxmaxima does not completely solve a derivative

Question

I don't know why wxmaxima doesn't give me the complete result, leaving an expressed derivative and not solving it

I don't understand what I could be doing wrong. If anyone can help me, thank you in advance.

Note: Wxmaxima version 19.01.2x ; Maxima version 5.42.2

Here is the code in text:

kill(all);
declare(V,constant,R,constant,a,constant,b,constant);
P:R*T/(V-b)*(%e)^{-a/(R*T*V)};
diff(P,T);

Answer 1

Note that Maxima uses only parentheses (i.e., ( )) for grouping. Curly braces { } denote sets, and square braces [ ] denote lists.

Try writing the exponential as %e^(-a/(R*T*V)), I think that should fix it.