$25x^2-40x+400$
$\lim_{x\to3}\frac{x^3-7x^2+15x-9}{x^2-6x+9}$
$\lim_{x\to3}\left(\frac{x^2-4x+3}{x-3}\right)$
$\lim_{x\to0}\left(\frac{e^x-1}{e^{x^2}-1}\right)$
$( x ^ { 4 } - 2 x ^ { 3 } - x$
$n2+10n$
$\left(3x^3y^2+3x^2y^2-18xy^2\right)$
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