$a^2-ab=a$
$2m+3m^2-4m$
$\lim_{x\to0}\left(\frac{1}{2^x}\right)$
$\frac{x^2+6x+9}{x^2-9}$
$12cos^2x-9=0$
$\left(x+3y^2\right)\left(-2x-y\right)$
$\frac{x^{4}-3^{4}}{x^{2}-3^{2}}$
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