$\frac{2x^2}{2x^2-4x+3}$

$x^2\left(x^3+6x^2-3\right)$

$lny=ln\left(x^{lnx}\right)$

$\lim_{x\to\infty}\left(\frac{12x-4x^2}{x^3-3x^2+4x}\right)$

$\lim_{x\to1}\left(\frac{\ln\left(2x^2+1\right)}{\tan\left(x-1\right)}\right)$

$20x^3-50x^2-30x-0$

$2\left(x-y\right)\left(x+y\right)$