$xy.\frac{dy}{dx}=2+y^2$
$v2-27v+50$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{-sinx+cosx}{tanx}\right)$
$x^2\left(\frac{dy}{dx}\right)-y\sqrt{x}=0$
$\left(a^2-b^2\:\right)\left(x^2+1\right)+2\left(a^2+b^2\:\right)x$
$\frac{x^3+5}{x^2-1}$
$4x^2-4x+16a$
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