$\left(x^3+16\right)\left(x^3-5\right)$

$\int\frac{\left(3x+2\right)\left(x-4\right)}{x-3}dx$

$\int_2^8\left(-1-\sqrt{-x^2+10x-16}\right)dx$

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

$12\left(\frac{5x}{5}\right)$

$4a^2-9b^2$

$\left(\sqrt{3}+2cos\left(x\right)\right)\left(1-2sen\left(x\right)\right)$