$-9k\:+\:8k$
$2x^3-5x^2-3x^2+\sqrt{16}-\sqrt[3]{-8}$
$\left(4pq^3+3pq^2\right)^3$
$\lim_{x\to\infty}\left(\sqrt{x^2+7}-x\right)$
$\lim_{x\to-2}\left(3-x\right)^2$
$-12-8\left(+9\right)\cdot\left(4\right)-14+6+5$
$\cot\left(x\right)\sin\left(x\right)\sec^2\left(x\right)$
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