$( - 2 ) \times ( - 2 )$
$30a^5b^3-10a^2b$
$\frac{3x^2-3x-2}{x-1}$
$\lim_{x\to1}\frac{\sqrt{x^2+500x-1}-\sqrt{x^3+500x-1}}{x-1}$
$7x^3+5x^2$
$\left(w^2+2\right)\left(w^2+3w+9\right)$
$\left(x+42\right)^2$
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