Hi, I am sorry for asking this, but I have been looking all over the internet now and I can't find any solution to this.
When i am using desolve i sometimes get some crazy outputs which is not relevant for me at all.
For instance i am trying to desolve this equation
y' = 0.00054 \cdot y \cdot (500 - y)
So i white
k = var('k')
x = var('x')
y = function('y')(x)
Then i define my de
de = diff(y,x) == 0.00054*1*y*(500-y)
And i desolve like i have done before with many other equations without any problem
desolve(de,y,[0,90])
But i get this result
-100/27*log(y(x) - 500) + 100/27*log(y(x)) == -100/27*I*pi + x - 100/27*log(410) + 100/27*log(90)
The right result should be:
y = 500/(1+4.556*e^(-0.27*x))
Please help me. I have been readning in the doc section about desolve and many other places, but there is so much stuff i dont understand. I am on the edge to install a subsitute CAS program to help me everytime sagemath fails.
