$\int\frac{\sqrt{u}^6}{4+\sqrt[3]{u^6}}dx$

$\lim_{x\to0}\left(\frac{3x^2}{\tan x^2}\right)$

$9x^6-4y^2$

$\lim_{x\to\infty}\left(5x^2e^{-x}\right)$

$\lim\:_{x\to\:-1}\left(\frac{\sqrt{2}-\sqrt{x+3}}{x^2-1}\right)$

$2\left(2m+1\right)+5m$

$\frac{3v^8}{3\left(v^5\right)^3}$