$\frac{x\:^5+\:3x}{x}$
$144x^2+72xy+9y^2$
$\frac{81x^4y^2}{2}+36x^2y+8$
$x^2-\left(x-2y\right)^2$
$16x^2y^3-24x^2y^3$
$\lim_{x\to23}\frac{x^2-529}{437-4x-x^2}$
$\frac{d^2y}{dx^2}=8x^4-\frac{1}{x^2}$
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