$4a^2-12ab-ab^2$
$2.25+.75$
$5 x ^ { 3 } + 7 x ^ { 4 } + 6 x ^ { 3 } - 5 x + 4$
$\frac{16x^2-4}{4x+2}$
$\frac{-1^{n+1}}{-1^n}$
$\frac{dy}{dx}\left(y=2-3x-\left(\frac{1}{x}\right)\right)$
$12k^3\:-\:30k^4$
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