$\int e^{-x}\sin\left(2x\right)dx$
$\frac{x^3+2x^3+4}{x^3+2x^2+1}$
$2\left(\tan\left(50\right)\right)^2$
$\lim_{x\to0}\left(\frac{xe^x}{2^x-1}\right)$
$a^2+30a+225$
$\left|-123\right|$
$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$
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