$m^2+n^2+3n+4n^25m^2-5n^2$
$\frac{8x^4+4x^2-1}{x^2-x-2}$
$x-\frac{1}{\left(x+1\right)^2}=2xy$
$8m^3+5mn+8m^2-8m^3+mn$
$f\left(x\right)=\left(x+2\right)e^{-2x}$
$256\:a^{16}-81\:b^4$
$\int_{\infty}^0\left(\ln\left(x\right)\right)dx$
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