$\lim_{x\to3.001}\:\left(\frac{x-3}{x^2-9}\right)$

$y'\cdot\left(\frac{\cos\left(y\right)\:}{x^3}\right)-\frac{\ln\left(x^3\right)}{\left(\sin\left(y\right)\right)^3}=0$

$2\left(x+3\right)^2-1$

$\left(x^3y-11\right)^3$

$\frac{d}{dx}\left(x^2+xy+y^3=8\right)$

$\sqrt{\frac{6-7x+5x^2}{10}}$

$\frac{dy}{dx}\left(3x^3+9xy^2=5x^3\right)$