Find the gradient of f(x,y)=x2y+xy2f(x,y) = x^2y + xy^2f(x,y)=x2y+xy2 at the point (1,1)(1, 1)(1,1).
(3, 3)(3,\; 3)(3,3)
(2, 2)(2,\; 2)(2,2)
(1, 1)(1,\; 1)(1,1)
(3, 0)(3,\; 0)(3,0)