$x-x-y-3+x-y+2-x+2y-2-x-y$
$\frac{dy}{dx}=\sqrt{39}si\:\sqrt{36}=6$
$x^2+\frac{6}{9}x+\frac{1}{9}$
$0\ge x^2+x-2$
$x^2-32x+64$
$2a^2-3ab+b^2a^2+5ab$
$\sqrt{a^2b^2}$
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