alysis 6. Cauchy's Theorem EXERCISES 6.1. Let y be a contour such that 0 € I(y). Show that ["dz = { Bri 2πi 0 if n=-1 otherwise. By taking y as the ellipse ((x,y): += 1), a² dt 62 a² cos2t+62 sin² t = show that 2π S₂ 2π ab • 1