$\frac{\sin\left(x\right)}{csc\left(x\right)-1}+\frac{\sin\left(x\right)}{csc\left(x\right)}$

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

$5cotx-1=0$

$\int_0^{\pi\:}\left(2\pi\:\:\:\theta\:sen\left(\theta\:\right)\sqrt{1+\theta\:^2}\right)\:d\theta\:$

$\frac{x^4+2}{x^2+5x+4}$

$\sqrt{\left(9-1\right)}^2+\left(1-1\right)^2$

$\frac{dy}{dx}=\frac{x^2-9}{x^2-4}$