$a\left(x\right)-6x^3+5x^2-4x$

$\frac{dy}{dx}\left(x^2+2y^2=6x-16y+11\right)$

$8\cos^2\left(y\right)dx\:+\csc^2\left(x\right)dy\:=0$

$\left(\frac{1}{3}\right)^{-1}\cdot3^{-2}-\left(\frac{2}{3}\right)\cdot\left(\frac{1}{2}+6\right)$

$x^2+3x+2x+6$

$x^6-729y^6$

$4-x\le5x+8$