Let F be the vector field given by F(x, y, 2) = In (xBy3=2+1) 27 ty4 45 - yx e2, cos? (xz)xy2, ery + cos z sin (23) Let S be the upper hemisphere (z > 0) of the sphere of radius 2 centred at the origin, oriented with unit outward normal. By using a version of Stokes' theorem, compute SIs(V x F) . nds