Wave propagating in the opposite sense of the direction for specific values
Greetings from Brazil!
I'm currently developing an app using the parametric curve command: a = Curve(u, H*cos(ωt -βu),u, -λ,2λ). When I move the t slider the wave propagates towards +x according to the argument of the cosine: ωt -βu. The problem is that when ω < 1750 the wave propagates towards -x, which is wrong, mathematically speaking. All variables I defined can only be positive so I really need an explanation or help for this case. I'm using the GeoGebra App for Google Chrome to edit this file but in GeoGebra Classic 5 for Windows 10 the problem continues.
The file is attached.
Thank you for your time!