4) (6 points) EVALUATE the integral F. d, where F(x, y, z) = < cos(y) + ycos(x), sin(x) xsin(y), xyz > and C is the boundary of the portion of z = y over the square in the xy-plane with vertices (0, 0), (2, 0), (2, 2), and (0, 2). Assume a positive orientation from above. (Hint: Use an appropriate theorem.)