Part 4 and 5 please

4. Use Green's Theorem to prove that the area of an ellipse is aim, where a and b represent axes's lengths. 5. Use Green's Theorem to find the work done by the vector field F(x, y) = (7x 4y, 9x 2y) on a particle as the particle moves counterclockwise around the ellipse 2x2 + By2 : 200