Proof of cos2x=(cosx)^2-(sinx)^2=2(cosx)^2 1=1-2(sinx)^2

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My second attempt at an actual in class video. This one was way harder to edit and I'm not sure how I feel about it.

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Mothe: our son will be a singer
father: no our son will be a teacher
son:

shreerajnandre

damn.. I wish I had a teacher like
that, he is so funny

Rahul-eyoq

you make studying this a lot of fun =D

haydeefernandez

The way he speaks... I wanna be in his class. "Double Angle

EliteRowmaster

24. If x = cos e * c * A + cos A and y = cos e * c * A - cos A (2/(x + y)) ^ 2 + ((x - y)/2) ^ 2 = 1 then prove th

maharanaofficial

I wish if in Pakistan we have teacher like him. My teacher always holding long 3 inches thick stick in her hand and targeting booties.

flyingbirds

He is doing in a sing song way so it sticks in his students memory. Fun fact the last thing alzheimers patients forget is music.

xolwora

What did you do on the 2nd to the last step??? The one that have curved lines???

Why cos^2x-(1-cos^2x)
Become cos^2x-1+cos^2x)

Please i need the explanation badly 😖 thanks.

jeremyjumaquio

Nicely expalined. I just want this type of cool teachers in India also😑

ayushijoshi

this is really awesome! i'm a mexican highschool student, but in my class the teacher doesn't explain this identy, but now i need to solve some trigonometric equations using this and i don't know how :c

Jade-pptl

Are you studing it in school? In which grade?

Палитра

If cos2x cosx cosx/2 sinx/2 = 1/24 what is the answer of cos8x ?

froghahmadi

Thank you so much I've been stuck on this for days!

JaySmiley

YES! Thank you!! My current prof is great, he knows his stuff, but you are the COMPLETE opposite of his monotone :P

moink

its like youve been cursed with the " always keep singing" curse, it makes it kinda fun haha

imhomewiththemilk

Just too easy
We pass much harder than this and be questioned much and much hareder in our UEE

moeinvalinejad

I understood a lot from this video. Thanks a lot, love from Indonesia

RikyPerdana

*This was so helpful, thanks so much(:*

soyer_mf

but .... how does this help me figure out the price of tea in China?.... lol. Great video. THANK YOU.... funny too.. and yet Educational... change your name to Ed U. Cational ...

ptyptypty

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