$\left(9x^2-y\right)\left(9x^2+y\right)$
$\sqrt[3]{a}-3a^{\frac{1}{3}}+\sqrt[3]{\frac{a}{8}}$
$x^3-4x^2-11x+30$
$\cos\left(x\right)=-\cos\left(x\right)$
$\frac{2x^2-1}{x-2}$
$\frac{2x^2+10}{x^2+3}$
$s^2-4s+5$
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