Problem

(B). Find $\dfrac{\mathrm{d}y}{\mathrm{d}x}=\underline{\quad(2)\quad}$ and $\dfrac{\mathrm{d}^2y}{\mathrm{d}x^2}=\underline{\quad(3)\quad}$ at the point $x=1$, $y=1$ of the curve $x^3+xy-2y^4=0$.