$\:sen\:\left(30^{\circ}\right).cos\left(53^{\circ}\right).sec\left(60^{\circ}\right)$

$\lim_{x\to3}\left(\left(5x^{2}-9x+7\right)\right)$

$1 \frac { x } { x }$

$\left(3m^2+2m^3n\right)^3$

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

$\left(\sqrt{7}-2n\right)\left(\sqrt{7}+2n\right)$

$\left(z^3+y^4\right)^5$