$\lim_{x\to-6}\left(\frac{x^2+7x+6}{x+6}\right)$

$\left|4-5\right|$

$\left(x+3\right)\left(x^2-3x+9\right)\left(x^2+3x+9\right)\left(x-3\right)$

$4n^2-n-33$

$\frac{dy}{dt}+e^ty=4e^t$

$\lim_{x\to\infty}\left(ln\left(2x^2+1\right)-ln\left(x^2+1\right)\right)$

$39\cdot24$