$\int e^{-30x}sin\left(40x\right)dx$
$\int\left(t+1\right)^5e^{-2t}dt$
$\int-5x^2\:e^{-3x}dx$
$\frac{1}{9x+18}$
$\lim_{x\to a}\left(\frac{1}{x-1}-\frac{1}{\ln\left(x\right)}\right)$
$2n^4\left(2n^{-2}\right)$
$2a^4-\:\:4a^2b^2+2b^4$
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