Using de Moivre's Theorem - Example (1) : ExamSolutions Maths Revision Tutorials

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I'm working through the videos in order on your site. Have I missed a video which expands upon the statement in the green box? I think it makes sense, I just want to see if there are any more of these identities that I've missed. Thanks!  

Zoibie
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The thing on green box is the expansion from arg theta, so the operation on theta should be ongoing
simultaneously?

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