$m^12-n^12$
$\left(x+4\right)^{2}-\left(x-1\right)^{2}$
$9z^2-42xz+49^2$
$\int\frac{9x+7}{6x^2-13x-5}dx$
$\lim_{x\to0}\left(\frac{x^2}{x-sinx}\right)$
$\frac{m^2+2m-10}{m-2}$
$\left(-3.4\right)\left(-2\right)$
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