Find the Hessian matrix HfH_fHf of f(x,y)=x3+y2f(x,y) = x^3 + y^2f(x,y)=x3+y2.
(6x002)\begin{pmatrix} 6x & 0 \\ 0 & 2 \end{pmatrix}(6x002)
(3x2002y)\begin{pmatrix} 3x^2 & 0 \\ 0 & 2y \end{pmatrix}(3x2002y)
(6002)\begin{pmatrix} 6 & 0 \\ 0 & 2 \end{pmatrix}(6002)
(6x112)\begin{pmatrix} 6x & 1 \\ 1 & 2 \end{pmatrix}(6x112)