$\frac{d}{dx}\left(y=a^x+x^a\right)$
$\frac{5^n-1^n}{5-1}$
$\left(3x+9\right)\left(3x-9\right)$
$\frac{d}{dx}e^{xy}-x^8+y^8$
$\left(y-4\right)\left(y-4\right)^2$
$\frac{2x^2-2x-4}{x^2+4x+3}$
$9+3\left(x-3\right)+y$
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