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$\left(xy+3y\right)\left(xy-3y\right)$
$6x^2+10x+12x^3$
$\frac{x+1}{x^2-4x+4}+\frac{4}{x^2+3x-10}$
$\int\frac{1}{\cos\left(u\right)-1}du$
$y-3x+6z+5z-5x+8z$
$-16v^2+72>25$
$\left(3\sqrt{3}+\sqrt{6}\right)\left(3\sqrt{3}-\sqrt{6}\right)$
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