$\left(a^2+4b^2\right)\left(a^2-4b^2\right)$
$\lim_{x\to0.99}\left(\frac{2x+1}{x-1}\right)$
$\left(x^n-6\right)\left(x^n+6\right)$
$\int\frac{1}{4}xdx$
$\frac{7\left(x^2-2x+5\right)}{3}$
$9x^2+12x+32$
$y=5x^{-x}$
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