$13+6+12+-15$
$\sqrt{-3x^2-2x+1}=0$
$\frac{d}{dx}y=x=45$
$\frac{d}{dx}e^{-y}$
$10\sin4x\cos4x$
$\frac{d}{dx}\:x\sqrt{y}-x^3y^2=x-y$
$\frac{28x^9y^{12}}{14x^2y^2}$
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