$\ln e^{2.72}$

$\left(-11-a\right)^2\left(1-a\right)$

$\int_{-\infty}^0\left(\frac{2x^3}{1+x^2}\right)dx$

$\lim_{x\to1}\left(\frac{1-x-lnx}{x^3-3x+2}\right)$

$\tan x=\frac{41}{28}$

$\frac{4x^2-96x-576}{4}$

$\frac{4}{5}\cdot\left(x+4\right)\ge\frac{5}{6}\cdot\left(x-2\right)$