$900\cdot900$
$\ln\left(\frac{x^2}{\sqrt[4]{\left(1-x\right)}}\right)$
$\frac{10x^3+10x}{5x}$
$\lim_{x\to0}\left(\frac{x^2+x-6}{x^2-3x+2}\right)$
$n^2-18n+10$
$x^4+x^2-20$
$-81+81a^2$
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