$x^6-64$
$\lim_{x\to\infty}\frac{4x^2+5x-2}{3x^4+1}$
$\left(3m^4+5\right)\left(3m^4-5\right)$
$\lim_{x,y\to0,0}\left(\frac{\left(x-y\right)^2}{x^2+y^2}\right)$
$3x^2-108a^2$
$y=\cos\left(3x\right)-\frac{1}{x}$
$x^2-20x+1$
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