$\lim_{x\to\infty}\left(\frac{2x+1}{\left(x+4\right)^4}\right)$
$-4x^2-16y$
$\int\left(\frac{1}{9-5x^2}\right)dx$
$10cm\:-25cm^2$
$8m^2-8mn^3+4n^6$
$\int\left(\frac{x^2}{x^4-10x^2+9}\right)dx$
$\left(3a^3-2b\right)^4$
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