Find the directional derivative of f(x,y)=x2+y2f(x, y) = x^2 + y^2f(x,y)=x2+y2 at (1,0)(1, 0)(1,0) in the direction of u=⟨0,1⟩\mathbf{u} = \langle 0, 1 \rangleu=⟨0,1⟩.
000
111
222
−1-1−1