Let f(x, y) = 2 sin(x². y) + by³ where b is a real number. Suppose that the direction of maximum change of fat (xo, yo) = (-1, 1) is given by (-4,1). Which of the following is the value of b? Select one alternative Ob=2 Ob=0 O b=1 Ob=3

Here, we have used the concept that the direction of maximum change of function at a point is given by gradient of the function at that point.