What is the value of the derivative of LaTeX: 4x-x^{2}y+y^{3}=10 4 x x 2 y + y 3 = 10 at the point LaTeX: (1, 2) ( 1 , 2 ) ? LaTeX: \frac{dy}{dx}=0 LaTeX: \frac{dy}{dx}=-1 LaTeX: \frac{dy}{dx}=2 LaTeX: \frac{dy}{dx}=1