$5m^2+2n-2m^2-n$

$f\cdot3f^4$

$\int\left(\frac{3}{2x^2+5x+2}\right)dx$

$\frac{dy}{dx}+y=e^{x+2}$

$\frac{\left(3+4x\right)^2}{\left(3+4x\right)\:}$

$\lim_{x\to\infty}\left(\frac{x^2}{\ln\left(x+2\right)}\right)$

$cos^2x-cos^4x=cos^2x\:sen^2x$