7. [0/1 Points] DETAILS PREVIOUS ANSWERS SCALCET8 14.6.004. Find the directional derivative of f at the given point in the direction indicated by the angle e. f(x, y) = xy - x, (1, 2), 8 = 1/3 DJf(1, 2) = -2+3V3 X 8. [-/1 Points] DETAILS SCALCETS 14.6.005. Find the directional derivative of fat the given point in the direction indicated by the angle e. Ax y) = y cos(xy), (0, 1), 8 = 1/4 DJ (0, 1 ) = 9. [-/3 Points] DETAILS SCALCETS 14.6.009. N Consider the following. f(x, y. 2) = xyz -xy/2', A(2, -1, 1). = 0. 6 -2) (= ) Find the gradient of f. Vix, y. z) = (b) Evaluate the gradient at the point P. VA(2, -1, 1) = (c) Find the rate of change of fat P in the direction of the vector u. Duf(2, -1, 1) = Need Help? Watch It