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

Example question using de Moivre's theorem
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[@Matchbox201000]

You have great instructional videos on mathematics, awesome.

[@AustinBsOfficial]

Thanks alot really helped!

[@giinyeanglee9072]

Well-explained!

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[@beautifulaffliction1742]

Specialist?

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Very clear explanation. I love it❣️

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

[@ExamSolutions_Maths]

Thanks, Good luck with your course.

[@jonathan1391544]

nice, I'm using this from my further maths A levels and am also gonna study engineering so I'm sure it will help there too

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Love your work ❤

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thank you a lot!

[@ALCHEMIC_kroky46]

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That was amazing

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[@ExamSolutions_Maths]

+GameChaser2011 Thank you.

[@MyStyles]

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[@ladycehairandbeauty]

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

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just when i thought i am gonna fail maths, thank you so much :) thank you a million
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+Nozipho Sithebe Never think you are going to fail. There is always a way.

[@khanemmanuel1182]

May God bless you sir

[@LukeDarkmusic]

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

[@nishat9091]

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[@ExamSolutions_Maths]

That's good - thanks for watching.

[@atumanyajoshuakagumire2564]

thanks

[@awethugomba5746]

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

[@ExamSolutions_Maths]

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

[@ashgreninja1913]

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.

[@basketweaver1144]

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

[@dalvinderkingra3360]

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

[@danieloh1353]

Sugene Kim approved

[@mouradsourdi989]

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?

[@mahdihasan6686]

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

[@basketweaver1144]

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

[@basketweaver1144]

Just checked, you can do it this way, with Zs or with es

[@jonathan1391544]

oh that's for this! I saw in a model answer they were using z and I was so confused and couldn't figure out where they got it from, so I'll stick to this :)