$\int e^{-x}\tan\left(e^{-x}\right)dx$
$\lim_{x\to0}\left(\frac{3x^3-6x}{7x^3+7}\right)$
$2x\:\frac{1}{5}$
$\left(4m+2n\right)\left(4m-2n\right)$
$\int11xe^{-2x}dx$
$-4.1-16.3$
$64x^2\:-\left(2x-1\right)^2$
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