$8x^9+\:27xy^{3n}$
$\left(7w+9k+3v\right)^2$
$\frac{dy}{dx}-xy=5x$
$\frac{u^2+1}{u+1}$
$\frac{x+4}{x^2+3x+2}$
$\lim_{x\to9}\left(\frac{9-x}{3-\sqrt{3}}\right)$
$\left(a^2+c^2\right)^2$
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