$\lim_{x\to\infty}\left(\frac{4-5x^3}{\sqrt{x^6+3}}\right)$
$2k^2+4k+1$
$37-x<35$
$\frac{dy}{dx}=\left(3xy^2-x\right)y^{-1}$
$\int t\cdot e^{3t}\:dt$
$x^2+y^2-8=0$
$\int\frac{1}{x\sqrt{x-12}}\:dx$
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