Evaluate the path integral fc F - dr, where F(x, y} = yi + xj and C is the line segment from (0, 0) to {1, 1)I which is either formed by {a} paths from (0, 0) to (l, 0), and from (1, 0] to (l, 1}; {b} the curve y = x2. By the path {a} the value of the path integral is Z By the path lb} the value of the path integral is S