Restricting the Domain of a implicit function in GeoGebra: sin(x + cos(y + sin(x + 1.68cos(y - 0.8sin(0.08x y))))) = 0. Elaboration
Restricting the Domain of a implicit function. Elaboration.
As it turns out, it is enough to specify a constraint on the variable x or y once, and the entire implicit function has these constraints.
Forum
https://www.reddit.com/r/geogebra/comments/1nxno5d/restricting_the_domain_of_a_implicit_function/
Here has been made into account mathmagicGG suggestion in the forum to make restrictions on a function of two variables!!!