$\frac{sin\:b}{1+cos\:b}+\frac{1+cos\:b}{sin\:b}$

$\frac{9x-5}{\left(x-1\right)\left(x+2\right)\left(x-3\right)}$

$4x^2-20+25$

$\frac{cotx}{cscxcosx}$

$\left(3-6v\right)^2$

$\:\frac{1}{72}\cos\left(3x\right)\:-\:\frac{1}{72}\cos\left(9x\right)$

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