I said to Mathematica to plot a graph as this:(adsbygoogle = window.adsbygoogle || []).push({});

Plot[Exp[-Sqrt[-x]] + Exp[Sqrt[-x]] - 2 == 0, {x, -10, 40}].

You can see that there is square root of -x, which should mean that the function is defined only for x<=0. But no, Mathematica would plot a curve also for positive values of x. How is this possible at all?

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# Mathematica plots wrong

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