$1+x-x^2\:yz-x^3\:yz$
$w^2+w-2$
$3x\left(3b^2+5ab\right)$
$\frac{d}{dx}\sqrt{2x^2-4}$
$-\sqrt{441}$
$\frac{\cos\left(x\right)-\sin\left(x\right)}{1-\cot\left(x\right)}$
$49x^8\frac{16}{25}y^4$
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