$\frac{1}{9}x^2\frac{2}{3}xy+y^2$
$\left(5y+6\right)\left(5y-6\right)$
$\left(5x^3+4\right)^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{x^2+\left(100x^2-1\right)^2}}{x}\right)$
$\frac{8y^4}{4y^3}$
$\frac{6}{x+1}=\frac{5}{x-1}$
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