Let f:r r be defined by xy fx, y)= }x+2, y)# (0, 0) 0 , y) = (0, 0) then, the directional derivative of f at (0, 0) in the direction of the vector (b) 2 1 (d) 1

Let f:R R be defined by xy fx, y)= }x+2, y)# (0, 0) 0 , y) = (0, 0) Then, the directional derivative of f at (0, 0) in the direction of the vector (b) 2 1 (d) 1 Ma) 1 (C 2 42