$\frac{\left(8x^2-20y^3\right)}{4x^2}$
$\lim_{x\to-\infty}\left(2x+3+\sqrt{4x^2+7}\right)$
$2\left(2x-1\right)-3x+2$
$\left(1-t^6\right)\left(t^4-2t\right)^2$
$w^2-4w-3=0$
$75y+64-9$
$\lim_{v\to\infty}\:\left[\frac{2cos\left(3x\right)}{x^2}-\frac{2}{x^2}\right]$
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