$8^2-6^2$
$\frac{d}{dx}t+ln|t|+c$
$\frac{a^6-b^{18}}{a^2-b^3}$
$\frac{1}{1-sin^2x}-1$
$5y+13-2y+7y-9$
$1+\frac{x}{1}-x$
$\frac{d^2y}{dx^2}si\:y=\frac{ax+b}{ax-b}$
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