$m2-13m+30$
$13x^2y^32$
$1+\tan\left(x\right)\tan\left(\frac{x}{2}\right)$
$2x^2-2x+2$
$\int\frac{2x}{\left(x^2-1\right)^5}dx$
$\frac{4}{9}m^2-25n^2$
$\left(\frac{3}{\sqrt{x}}-\sqrt{x}\right)\left(\frac{3}{\sqrt{x}}+\sqrt{x}\right)$
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