$\frac{dy}{dx}\left(y\:=\:x^2\sqrt{x-9}\right)$
$\frac{18}{2}$
$\left(y^2+xy-x^2\right)dx-\left(x^2\right)dy=0$
$-x^2-x^2-x^2$
$\frac{d^2}{dx^2}3\sin x+x^2\cos x$
$\lim_{n\to0}\left(\frac{ln\left(n\right)}{ln\left(2n\right)}\right)$
$-2\left(-2x^3-2x^2-x+9\right)$
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