Please post your file and the result you are expecting, as well your OS and GeoGebra version.
I think it's a bug (GGB-Algebra and/or GGB-CAS ).
Windows 10, GGB 5.0.553
I think that this equation needs to be solved in CAS.
GeoGebra problem is that it gives the extra solution in x=pi+2k pi, where the square root is not defined in R.
I’ve misread the parenthesis, and thought that the square root contained both sine and cosine functions!
Damn. I need holidays :(
Have a nice Sunday, mathmagic,
directly from the help notes of the command
Sometimes you need to do some manipulation to allow the automatic solver to work, for example
And it works.
I’m wondering what went wrong with the original equation. Maybe something related to the period of the solutions?
Anyway, solving the equation “old style”, that is paper and pencil, the extra solution is pi +2k pi, and the other two are correct.
I think the problem is in continuity
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