$\frac{2x^3-4x^2+3x^1-6}{x^1\:}$

$\int\left(x^2\left(2+x^3\right)^2\right)dx$

$\sin\left(x\right)\frac{d^2}{dx^2}\left(\cos\left(x\right)\sin\left(x\right)\right)$

$\int\frac{1-x}{\left(x-3\right)\left(x+2\right)^2}dx$

$\left(7-4n\right)\cdot6$

$x^2+14x-7=0$

$\lim_{x\to81}\left(\frac{\sqrt{82-x}-1}{9-\sqrt{x}}\right)$