$\cot\left(x\right)-\csc\left(x\right)=\frac{\cos\left(x\right)-1}{\sin\left(x\right)}$

$\frac{x^2-3x-3}{x-1}$

$x^2+15x+3=0$

$\int\frac{2}{3}x^{\frac{2}{9}}-\frac{1}{9x\left(\frac{3}{2}\right)}+\frac{2}{9x\left(\frac{6}{5}\right)}dx$

$4x^2+40x+9$

$27-27+9x^2-x^3$

$25n^2\:-\:30n\:+9$