$\left(5a^2b-2c\right)\left(5a^2b+2c\right)$
$25x^2+20x+3=0$
$5x^2y^2\left(2x+5xy+10\right)$
$\frac{\cos u}{1-\senu}=\sec u+\tan u$
$\frac{4x^2-9y^2}{2x+3y}$
$a-4=8$
$\frac{\sqrt{x}-\sqrt{9}}{\sqrt[3]{x^2}-\sqrt[3]{9^2}}$
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