$1034-9605$
$\left(a-2b^{-1}\right)^2$
$81x^2+3x+36$
$\lim_{x\to1}\left(\frac{e^x\left(2e^{2x^2}-2e^4\right)}{x-1}\right)$
$\left(5+a\right)\left(5-a\right)$
$x^2-5x-33$
$\frac{18x^2-9x-8x^4+2}{4x^2+1}$
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