$\left(+3^3\right)^3$

$11.8-2.9$

$\frac{d}{dx}\left(\frac{x-3}{x+2}\right)^2$

$\int\left(\frac{1}{\left(x^2+r^2\right)^{\left(\frac{3}{2}\right)}}\right)dx$

$4x\:+\:3y\:si\:x=2\:;\:y=3$

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

$m^2n^2x^4-\:9m^2n^2$