$\frac{x^5-x^4+x^2-2}{x^2+1}u$

$x^2\:+\:3y^2\:=\:3$

$\frac{3}{5}x^2-\frac{1}{3}xy-3xz+\frac{8}{3}xz+\frac{5}{2}x^3$

$\lim_{x\to\pi}\left(\frac{14\sin\left(x\right)}{x-\pi}\right)$

$12mx-18nx-16my+24ny$

$\frac{\cos\left(x\right)^2}{\sin\left(x\right)\cdot\tan\left(x\right)-2}$

$-3\left(2-\frac{1}{2}\left(4x+2\right)\right)-2x>\frac{1}{6}\left(x-2\right)$