$\lim_{x\to1}\left(\frac{\left(x-2\right)e^x+x+2}{\left(e^x-1\right)^3}\right)$

$\left(1+\frac{x}{4}\right)^n$

$\frac{1-cos\left(x\right)}{1+cos\left(x\right)}=cot^2\left(x\right)-2cot\left(x\right)csc\left(x\right)+csc^2\left(x\right)$

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

$n-n$

$1+1m^2$

$-x^2-x$