$\lim_{x\to-3}\left(\frac{x^2+5x+6}{\:x^2+9}\right)$
$-9d+sn-3d$
$4.\:\frac{1}{2}^3-9.\:\frac{2}{3}^3$
$a^3-4a^2+7a-28$
$3z^2+z-2$
$\sqrt{9-x^2}\cdot\sqrt{x^2-1}$
$\left(2a^2+b^2+c^2\right)^2$
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