$n^2-10n+9$
$w^2+12w$
$5^{-2}\cdot5^6$
$\frac{2}{1}+\frac{1}{1}$
$\cos\left(x\right)\cos\left(y\right)+\sin\left(x\right)\sin\left(y\right)-\left(\cos\left(x\right)\cos\left(y\right)+\sin\left(x\right)\sin\left(y\right)\right)$
$2\left(\sqrt{2a}2\sqrt{b}\right)$
$+2-2-7-4-8+2-13+14-12$
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