v(t)=f"(z0)z'(t0)≠0 Argw (to)= Argf(zo)+ Argz(to) 记 Ep Argf(zo)= Argw'(to)-Argz(o) 即 C:3=(t) r:w=fIz(t) T =∫(z) 0 0 0)9 u w'( t 0 ) = f '( z 0 ) z'( t 0 )  0 '( ) '( ) '( ) 0 0 0  Argw t = Argf z + Argz t 记    '( ) '( ) '( ) 0 0 0 即 Argf z = Argw t − Argz t 即  =  −  (1) C : z = z ( t ) o (z) x y ov ( w ) u  : w = f[z(t)] w= f (z) →  T '  T 0 z w0