$\lim_{x\to0}\left(\frac{\csc\left(x\right)}{\cot\left(x\right)}\right)$

$\left(11+x^2\right)^2$

$x+2<-2$

$\left(\frac{2}{3}x+\frac{1}{4}\right)^3$

$\int\frac{x^2+12x-5}{\left(x+1\right)^2\left(x-7\right)}dx$

$\left(2a+c\right)^2$

$\lim_{x\to0}\left(\frac{e^{kx}-kx-1}{x^2}\right)$