$\lim_{x\to0}\left(\frac{arctx-x}{x^2}\right)$
$\left(8a^2+8\right)\left(8a^2+7\right)$
$\frac{x^2-6x+9}{x^2-9x+10}$
$8x^3-27y^6$
$9x^2-48$
$\lim_{x\to0}\left(\frac{e^2-1-x}{x}\right)$
$\int\left(x+3\right)cos\left(x^2+6x-6\right)dx$
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