$3\left(9\right)^4-3\left(9\right)^3-\left(9\right)^2+3\left(9\right)-1\:$

$-3-2+-2+1$

$\int\left(x^6-64\right)^7x^5dx$

$\frac{1}{\csc x}$

$\left(x+1\right)\left(3-x\right)=3$

$\lim_{x\to\infty}\left(\frac{ln\left(n\right)^2}{n}\right)$

$\lim_{x\to\infty}\left(x-\frac{x^3-x}{x^2}\right)$