$\lim_{x\to2}\left(\frac{4x^2-8x}{2x^2-4x}\right)$

$\left(x-4\right)\left(6x+5\right)$

$2m\left(x+1\right)-3\left(x+1\right)$

$\int\left(\sqrt{9x^2-1}\right)dx$

$\left(21:3\right)+4\left(-3\right)^3+\left[\left(-3\right)\right]$

$\lim_{x\to-\infty}\left(\left(6-x\right)e^{\frac{x-4}{3}}-1\right)$

$\int4\left(4x-3\right)^5dx$