Question 3 > > For f(x, y) = 4x sin(xy) at the point (5, 3), the direction in which the maximum rate of change occurs is: (Your answer should be a unit vector.) Add Work Submit Question Find the directional derivative of the function: f(x,y) x+3y at the point (0,0) in the direction of the vector (1, 1). You may enter your answer as an expression or as a decimal with at least 4 significant figures. Add Work