$\frac{x}{\sqrt{x^2-x+1}}$
$a-\left(d-1\right)=c-d$
$y''-2y'-2y=0$
$\sqrt{25x^2+50xy+25y^2}$
$x^2+8x+15<0$
$x^4-81\ge0$
$\frac{d}{dx}\frac{x^2}{x+y}=y^2+1$
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