$\frac{2x-6x-2}{x-4}$

$\frac{1-\cos\beta}{\sin\beta}=\frac{\sin\beta}{1+\cos\beta}$

$\left(m^{10}\right)\left(m^4\right)^3$

$\frac{4.001\:\:-4}{\left(4.001\right)^2-3\left(4.001\right)-4}$

$x^3\left(x^{-1}-x\right)$

$2\left(x\sqrt{2}\right)\left(4x\sqrt{2}\right)$

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