21. For the unity feedback system of Figure P8.3, where K(s-1)(s-2) G(s) == s(s+ 1)(s+2) sketch the root locus and find the following: [Section: 8.51 a. The breakaway and break-in points b. The jo-axis crossing c. The range of gain to keep the system stable d. The value of K to yield a stable system with second- order complex poles, with a damping ratio of 0.5.