$28-\left(-37\right)$
$\frac{4x^4-10+10x^2}{-2x}$
$\int\frac{xd}{\left(x^2-1\right)}$
$\frac{dy}{dx}\cdot\frac{y}{x}=\sin\left(x\right)$
$\left(2\sqrt{5}-1\right)\left(2\sqrt{5}+1\right)$
$a^2-4\:\:\:\:a^2-b^2$
$\left(5x^2\right)^4$
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