$\int\frac{1}{\sqrt{7t-4}}dt$
$8-2\:x\:2+6+7\:x\:3-3\:x\:4+16$
$y'=2x+2-y$
$\lim_{x\to\infty}\left(\frac{cos^2n}{2^n}\right)$
$\int\frac{s-1}{s^2+s-6}dx$
$\frac{x^2\:-\:60x\:+\:900}{x^2\:-\:50x\:+\:600}$
$\lim_{x\to0}\left(\frac{-e^x+1}{xe^x}\right)$
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