$\left(a-2b\right)^2-\left(x+y\right)^2$
$\lim_{x\to-4}\left(2x^2+5x-22\right)$
$\frac{x^3-2x^2-4x+8}{x^2-4}$
$6+12y$
$\left(a+5\right)^2\left(a-5\right)^2$
$\int\frac{4x-18}{x\left(x^2+9\right)}dx$
$\left(-3x^2+6\right)\left(-3x^2-6\right)$
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