$\:4x\:-85-13x=149$
$\lim_{x\to0}\left(\frac{x}{\sqrt{1-x}-1}\right)$
$8x^2y^3\cdot x^4y^4$
$4-18-12$
$\int8xe^8dx$
$\lim_{x\to\infty}\left(1-\frac{2}{5x}\right)^{2x}$
$\frac{d}{dx}lnu^3$
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