$\lim_{x\to\infty}\left(\frac{4x^2+x}{x^2-1}\right)$
$x^2+18x+324$
$\frac{dy}{dt}-2e^t=0$
$2\sqrt{3}-\sqrt{27}$
$x2-2x-x+6$
$\lim_{x\to0}\frac{1-\cos\left(x^2\right)}{2x}$
$\left(m^2+1\right)\left(m^2-1\right)$
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