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Complex Variables : Prove the Complex Summation Identity

Write z=re^i0, where 0<r<1, in the summation formula that was derived in the example in Sec. 52. Then, with the aid of the theorem in Sec. 52 show that...
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A complex summation identity is proven. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.