$\lim_{x\to\infty}\:1-xe^{-x}$
$f\left(x\right)=\frac{x+\sqrt{3}x}{3x-1}$
$7y\frac{2}{5}$
$\left(100x^2-60xy\right)\left(9y^2\right)$
$4x+24x^2$
$\lim_{x\to\frac{\pi}{4}}\left(\cot x-1\cdot\sec\left(2x\right)\right)$
$\frac{4^8}{4^{-4}}$
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