$25y^2-104y+16$
$24x^2-15x+51$
$\left(\frac{2}{5}-mn\right)\left(\frac{2}{5}+mn\right)$
$\left(55\right)\left(75\right)$
$121m^2\:-\:144p^2$
$2xy^2-5xy^2-4xy^2$
$\frac{dy}{dx}=\frac{2y^2+9}{4x^2+25}$
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