$36x^2-216x$
$\int\left(t^2\right)e^{-21t}dt$
$\lim_{x\to\infty}\left(\frac{x}{25\left(25+x^2\right)}\right)$
$\frac{dy}{dx}=\frac{1}{2}-\frac{y}{200}$
$\int e^{-2t}dt$
$8pq+pq$
$\int\cot\left(d\right)$
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