$\frac{\sqrt{y^2}-9}{2y}$
$\frac{5}{7}-\frac{125}{s^3}$
$xy=-1$
$\left(3x+2y+3z\right)\:.\left(3x+2y-3z\right)$
$\int\frac{x^2+2}{\left(x+1\right)^3\left(x-2\right)}dx$
$\frac{1}{x^4-2x^2a+a^2}$
$x^2+8x+3$
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