$\frac{\tan\left(x\right)+\tan^3\left(x\right)}{\sec^2\left(x\right)}$

$\frac{dy}{dx}=\frac{\left(y-x+1\right)}{y-x-6}$

$\frac{d}{dx}y-\frac{2v}{x^2}$

$24^6$

$\sqrt{x+10}-\sqrt{x+19}=-1$

$\frac{d^2}{dx^2}\left(f^3\left(x\right)\right)$

$\lim_{x\to0}\left(\frac{\sqrt{1-x^2}-1}{x}\right)$