I know it's wrong, because that would imply -1 = 1. Shouldn't the property $a^\frac{b}{c} = \sqrt[c]{a^b}$ be applied here?
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10Welcome to Mathematics Stack Exchange. The rule $(a^m)^n=a^{m×n}$ does not always work when $m$ and $n$ are not integers; cf. this question – J. W. Tanner Aug 19 '20 at 02:05