$\sqrt{4x}$

$\left(8x^5+16x^3\right)\left(-x^2-2\right)$

$\frac{dy}{dx}=\sin\left(12x-13\right)$

$\frac{-4x^3+x^2-4}{x+19x-1}$

$\frac{dy}{dx}=x^2-\frac{2}{3}y$

$\int\frac{2x-1}{x^2+4x+3}dx$

$\lim_{x\to-\pi}\left(\frac{9\cos\left(x+9\right)}{\left(x+\pi\right)^2}\right)$