It's a question that has always popped up in my head. How is(adsbygoogle = window.adsbygoogle || []).push({}); f(x)= ±[itex]\sqrt{x}[/itex] not a function, if both the solutions are "symmetrical?"

Does this also mean that the inverse fucntion of even or periodic functions aren't real functions either? Futhermore, does this somehow apply to three-variable graphs as well?

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# How is sqrt(x) not a funtion?

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