$\frac{-4x^3-2x^2-x+1}{x+2}$

$\left(4x^3-2m+3x-y\right)+\left(3y-2x-3m\right)+\left(-x+5m-2x^3y\right)$

$\frac{dy}{dx}\left(cxy-cx-cy+c=0\right)$

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

$\int\frac{5}{9+2x^2}dx$

$\sqrt{2^{-6}\cdot6^{-2}}$

$\frac{\sin2\left(a\right)}{1-\cos^2\left(a\right)}=2\cot\left(a\right)$