$6a^2y+12by$
$225x^2-30x+1$
$4x^4-9y^4$
$f=\frac{7}{5}x^{-\frac{2}{3}}+\sqrt{x}-\frac{9}{2}x^2y^2$
$2x^2-2x+5$
$\lim_{y\to4}\left(\frac{y+2}{\sqrt{y+3}-1}\right).$
$9x^2<1$
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