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

$\lim_{x\to-\infty}\left(\frac{2x+\sqrt{x^2-x-1}}{x-5}\right)$

$\left(x^2-17\right)^2$

$2\sin\left(2x\right)-\sqrt{3}=0$

$f\left(x\right)=\frac{5}{1-x^6}$

$ax+bx+cx$

$\left(x+1\right)\frac{dy}{dx}=\frac{x^2-x-2}{y+1}$