Dear Tutors,

Please help me with this proof problem. Use the information included. Thanks!!!

Information Needed 3+ 2 TLK 2 = e disk Let D = B ( zo , r ) where r to ( means "excluding" H1 means "hypothesis ]": f is differentiable on D lie. for each z ED, lim f ( w)-f (2) exists W- Z H 2: f is differentiable on E f lim, f(z) ( 2-20 ) = 0 problem with info above, prove Thml: (Couchy - Gour sat w / H1, for every rectangle R in D f (z) dz = 0 R