Below is an explanation of where the root 2 and pi/4 come from in the solution to Q.20 on deMoivre's theorem (full question and solution linked here) I hope this is useful?

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Below is an explanation of where the root 2 and pi/4 come from in the solution to Q.20 on deMoivre's theorem (full question and solution linked here) I hope this is useful?
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