$\lim_{x\to3}\left(\frac{\sin\left(9-x^2\right)}{x-3}\right)$

$\int3x^2\sin\left(\frac{x}{4}\right)dx$

$\left(6x^4\:+\:5\right)^2$

$\left(6a^{-1\:}b^3\right)^{-2}$

$\int\frac{\left(x+4\right)}{\left(x+1\right)^2+4}dx$

$\lim_{x\to\infty}\left(\sqrt[3]{\left(x^3+x^2+x+1\right)}-x\right)$

$\mathrm{\frac{x}{x-3}\ge\:\:0}$