$\lim_{x\to+\infty}\left(x^2-\log_e\left(x\right)\right)$
$5x^2+6x+7x^2$
$36x^2-24x-96$
$\int\left(\frac{5x}{x^2-81}\right)dx$
$\int arcot\left(\frac{x}{2}\right)dx$
$\left(3x\right)^3-123x^3$
$\int\frac{4w}{\left(5-2w\right)^3}dw$
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