$\frac{9+\frac{1}{x}}{4-\frac{1}{x}}$
$y^2=2gx$
$\frac{x^3-3x+9}{3}$
$12a^2-5a-2$
$\int\frac{5x^2-x+6}{x^3-x^2}dx$
$3+3\tan^2$
$\left(3x-9\right)\left(2x+2\right)$
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