$9m^2-36n^2$
$\lim_{x\to2}\left(\frac{x^2-4}{3x^2-12x}\right)$
$\left(x^5\right)\cdot\left(4x^6-2x^4+6\right)^3$
$\int\frac{2}{4x^2-4x+1}dx$
$3\cdot89$
$81y^2+90y+25$
$10y-30-15y$
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