$\lim_{x\to2}\left(x^2+3x+1\right)$
$\frac{d}{dx}x=ye^y$
$\sqrt{x^2+y^2}=25$
$\frac{-2x^3+7x^2+9x}{x}$
$x^3+7x^2-5x-35$
$3x^3y-4x+5xy=0$
$\frac{4x-5}{7x}<2$
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