$\sqrt{5}\cdot\left(\sqrt{20}-\sqrt{5}\right)$
$30\cdot29$
$8xy9yx$
$\frac{x^2+2x-2}{x+3}$
$\left(-x^2-4\right)^2$
$4xy+\left(1+x^2\right)\left(\frac{dy}{dx}\right)=7x\left(1+x^2\right)^4$
$-127\cdot6$
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