$\frac{dy}{dx}\left(sin\left(9\:cos\:x\right)\right)$

$\left(0\right).\left(2-4x\right)^{-\frac{1}{3}}-\frac{1}{3}\left(2-4x\right)^{-\frac{2}{3}}:\left(4\right)\left(5\right)$

$2x^2+8x+20$

$\frac{x}{x^2+11x+30}$

$\frac{dx}{y}=\frac{dy}{-x}$

$-3x-2y^{15}$

$\frac{d}{dx}y=x^3+3x+2$