Find the gradient ∇f\nabla f∇f of f(x,y)=x2+y2f(x, y) = x^2 + y^2f(x,y)=x2+y2.
(2x2y)\begin{pmatrix} 2x \\ 2y \end{pmatrix}(2x2y)
(xy)\begin{pmatrix} x \\ y \end{pmatrix}(xy)
2x+2y2x + 2y2x+2y
(22)\begin{pmatrix} 2 \\ 2 \end{pmatrix}(22)