$1910-580$
$\frac{1}{\sqrt{9+x}}-\frac{1}{3}$
$\left(8-2\cdot3\right)\cdot7$
$\lim_{x\to3}\left(\frac{x^2-9}{5x^2+2}\right)$
$x^2\frac{dy}{dx}=xy-y,\:y\left(1\right)=1$
$\frac{dy}{dx}\left(y^2=x^{3x}\right)$
$8xy^3\:dx\:+\:12x^2y^2\:dy\:=\:0$
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