The domain of f(x, y) is the cy-plane, and values of f are given in the table below. 9\\2 0 12 3 4 0 65 66 65 65 65 1 62 61 62 61 60 2 65 68 69 68 67 3 69 69 71 72 73 4 67 66 67 67 67 Find So grad f . di, where C' is (a) A line from (1, 0) to (3, 4) So grad f . dr = (b) A circle of radius 1 centered at (2, 1) traversed counterclockwise. So grad f . dr =