$\left(mn-n\right)\left(mn+n\right)$
$\left(\frac{4}{3}x^3-8xy^2\right)^2$
$a^2+2a-3$
$\left(6a^2+9b^2\right)^2$
$\lim_{x,y\to0}\left(\frac{xy\sqrt{x^2+y^2}}{x^2+y^2}\right)$
$\frac{7^4}{7^{-2}}$
$\frac{a^{\frac{1}{2}}}{a^{\frac{3}{2}}}$
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