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

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[@Zoibie]

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!

[@ExamSolutions_Maths]

This is a basic identity often met in C1/C2. This should help I hope. www.examsolutions.net/maths-revision/core-maths/trigonometry/CosEqualNegCos/tutorial-1.php

[@Zoibie]

ExamSolutions Ah, of course. Thanks a lot!

[@tuneese2561]

@@Zoibie bro looll i did that section yesterday and i legit missed it by accident too

[@PhilipDee1]

Isn't (4pi/9) -(4pi/18)=2pi/9?

[@ExamSolutions_Maths]

Yes but it didn't say that. It was (4pi/9) - ( - 4pi/18) which is (4pi/9) + (4pi/18) = 12pi/18 = 2pi/3