$\lim_{x\to\infty}\:\frac{\sqrt{x}}{e^{\frac{x}{3}}}$

$\frac{16x^8-1}{2x^2+1}$

$\lim_{x\to-\infty}\left(\frac{\sqrt{x^2-2x+3}}{x+5}\right)$

$\int\frac{x}{\sqrt{a-bx}}dx$

$\frac{\left(x+y\right)\left(y+x\right)}{x}$

$\frac{5}{1-x}=y+2$

$\csc^2\left(30\right)\left(\tan\left(30\right)\right)\left(sin\left(30\right)\right)$