$\frac{4x}{\left(\left(x-2\right)\left(x^2+4\right)\right)}$
$\frac{x-1}{x}\le4$
$3-\left(x-5\right)^2$
$cos\frac{\sqrt{2}}{2}$
$25n^2-10n+1$
$x^2-25+x^2-10x+25-x^3+15x+125$
$y^6\:\cdot y^{-6}$
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