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[tex](-1)^{\frac{2}{3}} = undefined[/tex]

when I type it into my calculator.

But with manipulation,

[tex](-1)^{2/3} = [(-1)^{2}]^{\frac{1}{3}} = 1[/tex]

Am I missing something here? My textbook solutions manual says that you

*can*graph such a function for negative values, but when I plug it into, for example, my Mac's graphing software, it only graphs it for positive values of x.

Which one is correct?

Thanks!