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$3ab-1\cdot9a^2b^2+3a+1$
$\lim_{x\to\infty}\frac{x^2+2}{2x^2+1}^{x^2}$
$\lim_{x\to-\infty}4x^4-7x^3$
$\:2\left(3n\:+\:1\right)\:+\:3\left(n\:+\:2\right)$
$\left(x-10\right)\left(x+3\right)$
$c+4=7$
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