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1 point) Find the directional derivative off(x,y-x2y3 + 2x4y at the point (-4, 5) in the direction θ = Ï/3. The gradient of f is: Vf=( The directional derivative is: (1 point) Consider a function f(x, y) at the point (2, 6) At that point the function has directional derivatives: 5 in the direction (parallel to) (3,6), and in the direction (parallel to) (2,7). The gradient of f at the point (2, 6) is (1 point) Consider the function/(x,y) =-r-2y. Find the the directional derivative off at the point (-1,1) in the direction given by the angle θ = -10.08 Find the unit vector which describes the direction in which f is increasing most rapidly at (-,1