$-8+9\left(-3m-13\right)$
$\left(\left(\frac{45.33}{45.39}\right)-1\right)\cdot100$
$121a^4-44a^2b+4b^2$
$\frac{1}{3}\cdot21$
$\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)$
$\frac{-14}{\tan^2x}$
$\int xe^{x^2-3}dx$
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