$\left(-3x+19\right)^2$
$\frac{n+4}{n^2\cdot\:\:3^n}\left(x-2\right)^n\:$
$3q-5q$
$2x^3-8x^2$
$\frac{1+tan^2x}{secx}$
$\frac{d}{dx}\left(\frac{x^2-x}{x}\right)$
$m-4m$
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