$\left(3a^2\right)^3$
$\left(x^{-2}x^{-3}\right)^4$
$\left(3x^3\right)^2$
$\sqrt[3]{81y^7}$
$\left(3x^4\right)^4$
$\left(2n^4\right)^4$
$\left(4x^2\right)^3$
Two algebraic expressions are equivalent if they stay equal to each other, for any values their variables can take.
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