@janhardo ok best version, stop for now, regards

@janhardo I put the real theta and phi. Why from red to blu equation are inverted by software sign into for example cos(-theta(t) + phi(t))?

@janhardo thanks, which values of m and M you use?can I have mw file?I think your work is ok but little strange. You start with theta=1,5, phi=0,5. I see  theta big oscillations of theta over the time are on the left side of big circle but  the little oscillations are on left over the time (also phi). Maybe is caotic, what you think?After your new reply how i can put your reputation up?

@janhardo now is perfect sorry

@janhardo many thanks but I have many error (my maple is 2024). Your paper is ok but I want animation of design with two spring and bar if possible, regards

@acer in attach my problem, I can start by lagrange equation but I don't know ho plot for example: reflect(
    display([frames], insequence=true, scaling=constrained, tickmarks=[0,0]),
    [ [0,0], [1,0] ]);

@Kitonum thank at all by I don't need number value but simply until I have expression whit only sin(alpha)

image no inductor which value I attemp in the right? I dont know about left influence the right. you can send me the scheme with probe values (no inductor)?i can change i0 but is not automatic?@Joe Riel 

@Joe Riel yes but why the values are zero.I hope a bit of current and voltage.

yes I want know current and voltage in probe 5 @Joe Riel 

I have the same problem with 3.2.2. also I try to import model but I have "failed import",help me please

@Kitonum i need now volume equation not in polar coordinate.that's better than surface equation, please

@Kitonum can you give me the equation of above solid like this about cylinder, please?thanks

@Kitonum  z^2+y^2=1, x^2+y^2=1

I have similar problem.I have two solid (.stl format), I need the eqaution of intersection solid, can you helm me?please

ps: maybe this help you https://www.mapleprimes.com/questions/36316-I-Need-To-Plot-The-Solid-Created-By