$\int7xcos5xdx$

$\left[\left(-10\right)\:\cdot\:\left(+9\right)\:\right]\:+\:\left(\:-\:10\:\right)$

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

$f\left(x\right)=5\left(x+2\right)^{-3}-4$

$\lim_{n\to\infty}\left(\frac{2x^3-2x^2+x-3}{x^3+2x^2-x+1}\right)$

$\frac{25}{4}x^2+\frac{20}{3}xy+\frac{16}{9}y^2$

$\left(6mn-7\right)\:al\:cubo$