$\left(x^2-\:5\right)\left(x^2\:+\:9\right)$
$\left(-5x^2+3x-2\right)-\left(-3x^2\:-x-5\right)$
$\left(7u+3\right)\left(7u-3\right)$
$\left(1+\frac{x}{4}\right)^n$
$\frac{d^2}{dx^2}\left(\frac{1}{2}\cdot\:\sin\:\left(\frac{x}{3}\right)\right)$
$-11-\left(-10\right)$
$x^2-15x+54$
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