$9x^2-12x+36$
$2x^4+10x^3$
$\lim_{x\to\infty}\left(\frac{x^2}{x^2+4x+4}\right)$
$\lim_{x\to0}\frac{7^x-7}{x^2-1}$
$2^2-3y$
$y'=e^{xy}$
$\frac{x+10}{\left(x+2\right)\left(x+2\right)}$
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