$x^2-m^4-2m^2n-n^2$

$\lim_{x\to4}\left(\frac{2x^3-128}{x^2-16}\right)$

$f\left(2\right)=\:3\:\left(2\right)\left(2\right)\:+\:5x$

$10x+25x^{2}w+10w$

$\frac{d^2}{dx^2}\left(3x^2y^4+\frac{5x}{1+2y^2}\right)^2$

$\frac{3x}{2}=12$

$\frac{d^4}{dx^4}\left(\ln\left(x^2+1\right)\right)$