$\sqrt{y+20}=y$
$100x^2-60x-30$
$\lim_{x\to2}\left(\frac{x^2-8}{x-2}\right)$
$\frac{9x^2}{x^2+3}$
$\cos\left(x\right)=\frac{1}{7}$
$3t^3-42t^2+72t$
$\left(2-3y\:\right)^4$
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