Given that for ... use De Moivre's Theorem to show that

I am really hopelessly lost on this question.

Help is greatly appreciated.

Thanks in advance.

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- November 1st 2009, 07:37 PMI-ThinkSummation of complex numbers
Given that for ... use De Moivre's Theorem to show that

I am really hopelessly lost on this question.

Help is greatly appreciated.

Thanks in advance. - November 2nd 2009, 06:53 AMred_dog
Let

and

Then

Let

Then

Now use the sum of a geometric progression and put the right hand member in the form . Then