29.由下列各已知调和函数求解析函数 f(z)=u+iv =-|||-(1) =(x-y)((x)^2+4xy+(y)^2) ;-|||-(2) =dfrac (y)({x)^2+(y)^2} f(2)=0 ;-|||-(3) u=2(x-1)y f(2)=-i ;-|||-(4) =arctan dfrac (y)(x),xgt 0 -