y 2. Let C1 be the ellipse = 1 traced counterclockwise and C2 be the paral- 9 + 4 lelogram with vertices at (2, 1), (1, -1), (-1, -1), and (0, 1) traced clockwise. Define C = C UC2 F(x. y ) = ( 1 - y. ate"). (a) Evaluate F . dR by direct computation. Jc (b) Use Green's Theorem to find the value of F . dR. c (c) Use (a) and (b) to find the value of F . dR. JCz