$\lim_{x\to\infty}\left(1+\frac{2}{x+5}\right)^{x-1}$
$\left(x+1\right)\left(5x-2\right)$
$\left(10m+21n\right)\left(10m-21n\right)$
$32^2$
$a^2-5a-50$
$\lim_{x\to0}\left(\frac{9x^3-8x+2}{27x^3+2}\right)$
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