$22=t+u$
$\left(2m^3-5n\right)^2$
$\lim_{t\to0}\left(\frac{3sin\left(6t^6\right)}{-2t}\right)$
$-9\sqrt{21}-16\sqrt{21}$
$\lim_{x\to-2}\left(\frac{x^2+8x+12}{x+2}\right)$
$\int\:\sqrt{4x+2}\:dx$
$\int9^2^xdx$
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