$10x-8y\sqrt{x^2+1}\frac{dy}{dx}=0$

$2\:sin\left(x\right)\left(sin\left(3x\right)\right)$

$\frac{6x}{x+3}=3\frac{12}{x-3}$

$\lim_{x\to-2}\left(\frac{\sqrt{x+7}-\sqrt{-x^2+9}}{4x^3+32}\right)$

$2-\sqrt[3]{8}$

$g^2+6g+9$

$\left(3st^3\right)\left(5r\right)\left(3x\right)\left(6z\right)$