$\left(a+b\right)\left(m+n\right)$
$16x^2+26+13$
$\left(3a-4b^3\right)\left(3a+4b^3\right)$
$\int6y\:dx$
$\int\left(1+x^{-1}\right)^3\left(x^{-2}\right)dx$
$x+2\left(2x^3-8x^2-7x+20\right)$
$9m^2+54mn-81n^2$
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