$\left(3m+m^4+2n\right)^2$

$y=ln\:\left(x^3\sqrt{x^4+2}\right)$

$\left(13a^4\right).\left(-5b^4\right)$

$\left(5\:a\:+\:3\right)\:\left(25\:a^2\:-15a+\:9\right)$

$\frac{dy}{dx}=-8-2x$

$\frac{tanx-senx}{sen^3x}=\frac{senx}{1+cosx}$

$\lim\:_{x\to\:\infty\:\:}\left(n^2log\left(n\right)\right)$