$\lim_{x\to-\infty}\left(\frac{2x^3+7}{x^3-x^2+x+7}\right)$

$\sqrt[3]{81}^7v$

$\int\frac{1}{u^4}du$

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

$\frac{d}{dx}\frac{1}{2}t^4\:-\:5t^3\:+\:12t^2$

$x^2y\frac{4}{3}\cdot4x\frac{-4}{3}y^0$

$\int\frac{2x+1}{x^3+4x}dx$