... ıÙÛCf(z) dz + ıÙÛDf(z) dz12Exercise Set 3 p. 817 #1, 3, 5, 11, 13, 17, 21, 23 31 odd, 35 , 37 , 45p. 821 #1, 5, 7, 11, 13, 15, 23 Hand In1. Find functions f that do the following:(a) ... OıÙÛC11+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, 15p. 842 # 1, 3, 5, 7, 11, 215. Cauchy's Integral FormulaThis ... πi/2;(e) ln(-1) = πi + 2nπi; Ln (-1) = πi;(f) ln (3- 4i) = ln5 + i arg (3- 4i) + 2nπi = ln5 + i arctan(4 /3) + 2nπi; Ln (3- 4i) = ln5 + i arctan(4 /3) .More Properties1. ln(z w) = lnz + lnw; ln(z/w)...