$y=3x^{-2x}$
$\left(-2\right)\cdot\left|\left(+6\right)+\left(+4\right)-\left(3+7-1\right)\right|$
$\lim_{x\to1}\left(\frac{2x}{x-1}-\frac{1}{-3+3x}\right)$
$k2\:-\:12k\:+\:36$
$\int\frac{5y^2+6y}{10y+3}dy$
$\frac{\left(\csc\:^2\left(t\right)-1\right)}{\cot^2\left(t\right)}$
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