$\frac{dx}{dt}=-\frac{3x}{t}+t$
$\left(3x-2y\right)\left(-3x+2y\right)$
$\lim_{x\to\infty}\left(3-\sqrt{x^2+9}\right)$
$2\cdot128$
$36b^2-24b+8$
$\lim_{x\to-\infty}\left(\frac{4x-1}{2x+7}\right)$
$\lim_{x\to\infty}\left(\frac{2x^3-3x-4}{\sqrt{x^4+1}}\right)$
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