$\frac{d}{dx}\frac{9}{x}+\frac{19}{x^2}+15x^{-3}$
$\frac{dy}{dx}=y^{\frac{-1}{2}}\left(1-y\frac{3}{2}\right)$
$\left(60+49-12\right)-10$
$5x+-17z\cdot4y$
$x^2+2x-84=0$
$\frac{dy}{dx}\left(xy+\frac{2x}{y}-3x^2=5x-5\right)$
$sec\left(2x\right)=-3.326$
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