And is a classic and is of the square because you gonna have 1 y answering 2 x, so for the X that is in the R numbers you gonna have for all the cases but the vertex an Y that answer 2 X.
The reverse would be an X that have 2 answer and isn't that possible for a function you can have a problem but not a function. Rute Bezerra de Menezes Gondim
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