$\left(xy^0\right)^4\cdot x^3y^{-3}$
$\lim_{x\to0}\left(\frac{7^x-4^x}{x}\right)$
$logx=logx^2-12$
$x^{\frac{1}{2}}\cdot x^{\frac{4}{6}}$
$\left(x-4\right)\cdot\left(x+4\right)^2$
$3x^{2}+5x-2$
$\lim_{x\to2}\frac{x^2-4}{x^2+4}$
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