$\frac{dy}{dx}\left(\sqrt{x}+\sqrt{y}=2\right)$
$\sqrt{3^{-2}}$
$8\:.\:9\:-\:2\:.\:5$
$9m^2+12m+4m^2$
$7x+18\ge x+6$
$x-12x+49$
$2x^2-3x\:+\:8$
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