11. Use the flux form of Green's Theorem to find the outward flux of F across the boundary of the
given region D:
(a) F = \(x, y\), D is the disc $x^2 + y^2 < 4$; [Ans.: $8\pi$]
(b) F = \(yx^3, Ay - x\), D is the square with vertices (-2,0), (2,0), (2, 2), (-2, 2); [Ans.: 8A + 32]
(c) F = \(2xy, x^2 - y^2\), D is bounded by $y = x(2 - x)$ and $y = 0$.