The domain of f(x, y) is the xy-plane, and values of f are given in the table below. yx 0 1 2 3 4 0 65 66 67 66 66 1 67 67 68 67 68 Find fc grad ƒ dr, where C is (a) A line from (0, 4) to (1, 1). Jc grad f. dr = (b) A circle of radius 1 centered at (1, 2) traversed counterclockwise. So grad f. dr = 2 68 68 69 69 71 3 72 76 80 81 80 4 75 76 77 77 79