$\frac{1-\sin\left(x\right)^2}{\sin\left(x\right)}\frac{\cos\left(x\right)^2}{\sin\left(x\right)}$

$\int\:sec^3\left(\frac{x}{2}\right)dx$

$\lim_{x\to\infty}\left(1+\frac{2}{n+1}\right)$

$\int x\left(a-bx^2\right)^2dx$

$-5\left(\:p\:-\:6\right)\:$

$\int-8y\:dx$

$\left(\cot x-1\right)^2$