Do you know how to do this integral please?

  • Thread starter blueyellow
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  • #1
241
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What is the value of

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?
 

Answers and Replies

  • #2
1,137
0
is the whole z thing in cos ?

if that is so then take z common cancel it
you'll be left with 1/(Z-1)
 
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