@jganding 
Thank you it work

@raj2018 

to solve the differentail equation you must define the function V(phi) 

https://chat.openai.com/share/95b433e3-6375-44d8-84f4-c333d4d870ce

@Thomas Richard 

My license is very old Maple 13 2009. as I wrote it work perfectly for me ,unter Window 10, but not unter Window 11. do you have some ideas why especially for a 3D apllication Maple crashes?

thank you 

@Carl Love 

you are taking about syntax problem I am taking about crash problem !!

 > restart;
> plot3d(sin(2*x)*cos(2*y), x = 0 .. 2*Pi, y = 0 .. 2*Pi);

This program for example crashed unter Window 11 ???

@C_R 

 I get also a crash if I use the maple help window  , by scrolling the information 

for example

@acer 

o.k. I see thank you ,but how can i extend the path so maple can find my own library  ?

@dharr 

after i solve the equation i get this "latex" output, you can see that \it Omega 

1/2\,{\frac {{\it vx0}\,\sin \left( 2\,{\it Omega}\,\tau \right) +\cos
 \left( \lambda \right) g\tau}{{\it Omega}}}-1/4\,{\frac {\cos \left( 
\lambda \right) g\sin \left( 2\,{\it Omega}\,\tau \right) }{{{\it 
Omega}}^{2}}}
 

@acer 

thank you this work

@acer 

o.k thank you 

@acer 

Thank you very much for your help

@Carl Love 

thank you

@acer 

I found the error. 

for j to 16 do
pout := cat("C:/Users/Eli/Documents/Animation/", "file", j, ".bmp");
print(pout);
plotsetup(bmp, plotoutput = pout);
display(p4, p5, p6, p1, p2, p3, gg[j]);
fclose(pout) :
od:

od; this work
od: this dose't work ?
 

@acer 

Still dose't work ?

Waht I want to do , is  for each frame (gg[j])  produce a file .

for j to 16 do
pout := cat("C:/Users/Eli/Documents/Animation/", "file", j, ".bmp");
print(pout);
plotsetup(bmp, plotoutput = pout);
display(p4, p5, p6, p1, p2, p3, gg[j]);
fclose(pout) :
od:

 
 

@acer 

thank you this I can use I hope that the new Maple version, it is easy