Example using de Moivre's theorem (Trig. identities) : ExamSolutions Maths Video Tutorials

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Example question using de Moivre's theorem

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This is my first time finding you but thank you for the much needed help. Love from Australia.

lachie__
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Love your work helped me a lot in A-levels and now also helping my engineering degree :)

ankit
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You have great instructional videos on mathematics, awesome.

Matchbox
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Can you method be used to solve this problem as well?
Use de Moivre’s formula (10) with n = 2 to find trigonometric identities for
cos 2θ and sin 2θ.

ashgreninja
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if you are required to prove cos^5 theta, would you still expand it in the same way?

LukeDarkmusic
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At the you said it's not usual for it to be identical but is it not identical for all odd values of theta, not to resort to it, just as a check, just thought so as the Pascal's triangle is symmetrical and don't share a value in the middle at all odd values

dalvinderkingra
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how did he factorise by i ? shouldn't their still be i in the after the factorisation since the i's are raised to a power?

mouradsourdi
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So, so helpful, as usual Exam Solutions. I will be donating to you at some point as I must repay you for the help you have given me over the course of my A-levels.

GameChaser
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Our teacher make it so lengthy and you make it so easy. Love you 💕plz keep uploading bsc level mathematics ❤️ love from Pakistan 🇵🇰❤️❤️❤️

MyStyles
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Thank so much teacher I thought my math teacher will get disappointment results but I will surprise him always

ladycehairandbeauty
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Wow Im the first person to comment :) ... thank very much Sir u explained it very much better than my professor, WELL EXPLAINED IN JUST 10 MINUTES BUT IT TOOK MY PROFESSOR 45 MINUTES AND HE WAS EVEN STRUGGLING

awethugomba
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Can we use C and iS in our A-LEVEL EXAM??

mahdihasan
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just when i thought i am gonna fail maths, thank you so much :) thank you a million
times

noziphosithebe
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Thank you so much sir ....it helped me a lot👍👍👍

nishat
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Thank you for being the first to comment. Hope you find my other videos useful to.

ExamSolutions_Maths
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Haha, it's funny looking at the daily statistics, just before an FP2 exam this video gets an influx of views

basketweaver
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I hope it doesn't matter whether you do it this way or in terms of Z and Z^-1 because I've forgotten how to do it in terms of the Zs

basketweaver