Integral Hangs

[roadrunner]

This:

(02-08-2022 06:56 PM)parisse Wrote:  subst('integrate((1-exp(-2*x))/(1+exp(-4*x)),x)',x=t/2) => p; subst(p,t=2*x)

works on xcas, but on the prime i get this error message:

"p:=subst('∫((1-e^(-2*x))/(1+e^(-4*x)),x)',x = (t/2))
Error: Bad Argument Value","∫((1-e^(-2*t/2))/(1+e^(-4*t/2)),t/2)
Error: Bad Argument Value"

Is this because of:

a. Me doing something wrong;
b. A bug;
c. Some cas feature turned off in the prime for some reason;
d. Some combination of the above;
e. Something else?

-road