Trigonometric Expansions from Complex Numbers (2 of 3: Double angle results)

[@oscara1471]

When you procrastinate so heavily and you become such a pro at it, you will even watch videos like this. Help me

[@SeeTv.]

Use the 3,2,1 rule:
3
2
1
START doing what you should do
getting started is the hardest part, sooner than you think you'll fall into a flow mode and it's gonna be easier.

[@oliver9174]

@@SeeTv. like getting up in the morning

[@raphaelkimondo8566]

@@oliver9174 or paying taxes, or child support

[@Castillo_Daniela_unmsm]

I don't speak english, but mathematics is a new language

[@TheDavidlloydjones]

Memo to all math teachers: see at 0:38 where Eddie reproves himself for starting to write at the top of the white-board. "Oops," and starts writing on the second line -- because he knows he's going to write on the first line later:
He knows what he's doing! He's thought out what he's going to write, where and why...

[@jamiewalker329]

But the proof de Moivre's theorem (usually) is a proof by induction that uses the compound angle formulae...or is derived from the polar form of a complex number which requires knowledge of the derivatives of sine or cosine which in turn uses the compound angle formulae.

[@Arendt-Foucault]

說實話，看到封面，我還以為李小牧改行教數學了😂 I thought Mr.Xiaomu LI was starting to teach math.

[@vedishplays]

Hey i am from the video
[ Why 0! = 1 ]
Why noone has discovered (1/0)

[@jursamaj]

The only annoying thing here: waiting for part 3 to drop…

[@vamsi3594]

I am fourth

[@samuelsikulinec5187]

first

[@leesmith9299]

you mean (1 + 0i)st

[@ionknow2175]

@@leesmith9299 huh

[@leesmith9299]

@@ionknow2175 eh