The Cauchy's theorem extablishes that...
... where is the residue of each pole of f(*) inside . In Your case and is the unit circle... how many poles of f(*) are inside ?...
I know what Cauchy's theorem says, but I don't know how to evaluate an integral using it.
Can someone please post the steps showing how to do this?
(I not here asking you guys to do my hw for me. I'm going to have a similiar question on my final and would like know how to go about this type of problem)
Thanks in advance...
Also, Cauchy's Integral Formula says:
If f(z) is analytic in a region R containing a closed contour C and is any point enclosed by C then .
However, all this is irrelevant to your present question since the function you're integrating is analytic inside and on the closed contour |z| = 1 and so the value of the integral is zero.