$5a^2b^5\:+10ab-15ab^3$
$\cos x\sec x-\cos^2x$
$\frac{7x}{x-2}+7=2x-2$
$\frac{d}{dx}\left(4x^2-5x+3\right)^3$
$\frac{2x^2+x-8}{x+2}$
$-102-865$
$\left(4mn\right)\left(3m\right)\left(7n\right)\left(9mn\right)$
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