$\left(3b-y\right)\left(3b+n^2\right)$
$x^2+y^2=60$
$5^4\cdot5^{-2}$
$3x^2-3x+7$
$3x^3-12x^4$
$\int_1^{\infty}\left(\frac{3-\sqrt{x-1}}{\sqrt{x-1}}\right)dx$
$\frac{x^2+8x-9}{x-1}.\frac{4x^2}{x^2+x-72}$
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