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$ \sqrt[n]a= a^{\slfrac{1}{a}} $

Theory

$\sqrt[n]a= a^{\left.1\middle/a\right.}$

The $n$ th root of a number is equivalent to raising that number to the power of $\left.1\middle/n\right..$ $\sqrt[7]3 = 3^{\left.1\middle/7\right.}$