... ıÙÛCf(z) dz + ıÙÛDf(z) dz 12 Exercise Set 3p. 817 #1, 3, 5, 11 , 13 , 17 , 21, 23– 31 odd, 35, 37, 45p. 8 21 #1, 5, 7, 11 , 13 , 15 , 23Hand In 1. Find functions f that do the following:(a) ... Apply this to OıÙÛC 1 1+z2 dz where C is the circle |z| = 3.Exercise Set 4p. 832 #1 7 odd, 17 , 23, 29p. 837 # 1, 5, 9, 11 , 13 , 15 p. 842 # 1, 3, 5, 7, 11 , 21 5. Cauchy's Integral ... ln1 = 0 + 2nπi = 2nπi; Ln 1 = 0;(b) ln4 = 1. 386 + 2nπi; Ln 4 = 1. 386 (c) If r is real, thenln r = the usual value of ln r + 2nπi; Ln r = ln r(d) lni = πi/2 + 2nπi; Ln i = πi/2;(e) ln( -1) ...