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closed integral (C) of [cosh z/(z^2 -z)] dz

if C is

a) the circle |z|=2

b)the circle |z-i|=1/2

c)the circle |z-1|=1/2

i've tried reading up on cauchy's integral formulae in textbooks and my notes but i couldn't find an example which was similar. what do i do? do i hav to first turn the cosh z into a formula involving e's?