$3-2\left(x+4\right)<6\left(x-1\right)$
$\frac{625a^5b^3c}{25mn}$
$\frac{dy}{dx}=4y^2-1$
$2\cdot x^2+1\le3$
$\frac{d}{dx}\:\frac{x^4\sqrt[6]{x^3+1}}{x^2-1}$
$\left(3a^2-3\right)^2$
$\lim_{x\to21}\left(\frac{cos\left(x\right)-cos\left(21\right)}{441-x^2}\right)$
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