$cos\left(2x\right)cos\left(5x\right)-sen\left(2x\right)sen\left(5x\right)$

$\sqrt[28]{m^{20}}$

$\int\:-\frac{1}{9}x^{\frac{1}{\:3}}dx$

$\left(x-2\right)\left(x+2\right)\left(x^2+4\right)\left(x^4+16\right)$

$\lim_{x\to6}\left(\frac{x+6}{\left(x-6\right)^4}\right)$

$\int_{-3}^{\infty}\left(e^{-x}\right)dx$

$\frac{2}{3}\left(\frac{x-5}{4}\right)+\frac{2x}{5}$