10. Let F(x, y, =) = (2y cos(=), ex sin(=), xe"). (a) Find V x F. (b) Use Stoke's Theorem to evaluate / / ( v x F ) . nds, where D is the hemisphere a + y' + = = 9, = 2 0, oriented upward. Hint : Use cos(0) = 1 - cos(20) 2