A2

a) Evaluate the contour integral at infinity, which encloses all the poles and .l(z+1)(z1) branch cuts, for the complex function A(2) 2 Wang\") With real numbers a 2 1 and b 2 1. b) Derive the analytic result for 1 H d ,1(ax)(b+x) x you can consider integrating around a branch cut of A(z), together with the help from part (a)